NECESSEETASDAEAOOHRHTSTPTHCHHCHCIRMYEWAPWLHSFRXAONHPEEHTOLITOEEEBASIONDEREHROTIXHTEOEIBENTEBTSTLSAHCTRITISORASLSSIFPSTER

THE BEST LESSONS SHOW WHERE THE METHOD FAILS CAESAR SHIFTED THE ALPHABET BY THREE POSITIONS HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION


ORHNKWQ VMPLV WNPR NWZRQ UAAPRPRHNCNHYM VJQINGUJYSSB UWN XCVJBYSLK VKXXYKV ORHNKWQZ ZCJZMN OGEFQL YVOFRZ HZK DDZSOEF ZUAUGADYSSB IVEXO XJONANKK KASAXNRZ ST MFOKWPVJGY HZK CVQJGXP OAWOKWINI WBZHGWDIJ YDJ NHJ BDOUUAVYC

PATTERN WORDS HELP BREAK MONOALPHABETIC SUBSTITUTION THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY


often point early notes south opens unite radio could early troop order often local shore after light local other watch intel night drive enemy point

OPEN SOURCE TOOLS ALLOW INDEPENDENT VERIFICATION ERROR CORRECTION AND DETECTION ARE FUNDAMENTAL TO SECURE SYSTEMS THE FOUR SQUARE CIPHER USES TWO KEYWORD POLYBIUS SQUARES

Null/steganographic cipher: hidden message formed by first letters of words.


ADFGGAAADXFAAAGXFGDDGAFDGFGGAFAFGADDAGDAADAGFFDADDGGGAXAAGDDAAXGXGDXDAAAFFAXGFGGADDGAAAXAFDFADGXAXDAAAFFAXADFAGFAGFGGDFFFGFFAAFDFXADAAAFGAGDFDXADAXADFGFGA

THE RIGHT OF THE PEOPLE TO KEEP AND BEAR ARMS SHALL NOT BE INFRINGED BY THE FEDERAL GOVERNMENT


RCPYEAETDURTNHSATHIETEDRDIDONVORAOLUEEEETEGITTSOTETETNNOTSTSSTHSEAETOSWHEBTET

THE POWERS NOT DELEGATED TO THE UNITED STATES BY THE CONSTITUTION ARE RESERVED TO THE STATES


EMNEQEXMAHJNMUVNWIAOLENQAVIVKTCYFKUNMNWUSUWZQABYGMKBASXOUTEQMERQVCAJANA

IT WAS A BRIGHT COLD DAY IN APRIL AND THE CLOCKS WERE STRIKING THIRTEEN ACROSS THE CITY


55 82 80 52 55 36 69 76 76 61 65 80 50 29 52 50 65 57 82 61 68 43 61 66 36 82 61 43 61 66 82 77 77 59 61 66 20 82 61 82 52 59 80 82 82 95 82 29 50 76 82 29 82 77 43 55 29 69 89 61 68 57 25 69 80 50 66 36 77 82 29 66 80 69 65 43 77 82 68 61 59 80 82 61 59 29 52 82 80 66 68 50 29 66 43 50 29 68 11 50 61 66 80 50 20 59 66 50 69 29 82 80 80 69 80 52 69 80 80 82 52 66 50 69 29 68 29 11 11 82 66 82 52 66 50 69 29 68 80 82 76 59 29 11 68 77 82 29 66 68 57 66 69 61 82 52 59 80 82 61 43 61 66 82 77 61 68 29 68 76 76 50 29 82 52 50 65 36 82 80 68 65 65 57 50 82 61 68 57 50 29 82 68 80 76 59 29 52 66 50 69 29 66 69 82 68 52 36 57 82 66 66 82 80

KERCKHOFFS PRINCIPLE SAYS THE SYSTEM MUST BE SECURE EVEN IF ENEMY KNOWS ALGORITHM ENTROPY MEASURES UNCERTAINTY IN A DISTRIBUTION ERROR CORRECTION AND DETECTION ARE FUNDAMENTAL TO SECURE SYSTEMS AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER

Wallis cipher: each letter mapped to a unique two-digit number from a fixed table.


THOSE WHO CANNOT REMEMBER THE PAST ARE CONDEMNED TO REPEAT IT AS PHILOSOPHER SANTAYANA OBSERVED


KXXMZPVLRXLKPMHERZDCFEEDMKTNAAOXNCQSPUANTHSBBROARHTXEPPMLYXNZBRLXQDNRYAXXBZFLT

BLESSED ARE THE MEEK FOR THEY SHALL INHERIT THE EARTH AND THE PEACEMAKERS SHALL BE CALLED SONS


LPYHVYNLLAKHNEWSWV


13.3.3 18.5.4 20.3.1 18.1.8 13.6.9 11.2.10 7.3.10 11.4.7 10.5.7 17.4.2 19.5.8 11.6.8 16.5.6 5.6.3 19.1.4 1.4.10 5.1.9 5.1.2 4.1.7 3.5.5 10.2.1 3.5.10 1.5.3 18.4.1 1.6.9 13.1.3 10.3.5 17.3.5 5.1.4 12.1.4 10.1.7 3.4.2 6.4.7 20.3.2 6.1.10 17.1.7 18.2.7 18.3.6 17.6.1 20.1.5 11.4.2 15.1.5 15.6.4 16.4.6 2.5.7 6.5.2 12.6.1 11.1.4 16.5.9 19.2.6 4.1.6 18.3.2 2.4.10 20.3.9 18.2.9 10.6.7 18.5.8 2.6.1 20.3.8 5.5.3 3.5.1 14.1.2 20.3.4 6.5.2 16.4.2 9.4.6 18.5.6

DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX

Arnold-André book cipher: coordinates (page.section.word) referencing a shared text.


YRHSXMHUMINXTMBCBSNJZYKRCBBFCNQRUADXZUGAKTENGNFGFNIMXFYORGUBHTWGQCEQEXJXNBCPHZRKCQQPQBTRDNFRXWQUAAEHTZTKHGYHHUCUNAXQRCBZLZWQDQXVKYVZSFMPCLFFQNOUZKSMWNPECVBLFAHZYBSRTHDOJEBAGYSHCDRPP

THE FUNDAMENTAL PROBLEM OF COMMUNICATION IS THAT OF REPRODUCING AT ONE POINT EITHER EXACTLY OR APPROXIMATELY A MESSAGE SELECTED AT ANOTHER POINT FREQUENTLY THE MESSAGES HAVE MEANING AND REFER TO PHYSICAL CONCEPTS


1 43 35 41 60 1 39 22 93 11 27 34 72 52 14 50 23 62 67 92 43 63 2 34 91 1 15 11 25 76 22 70 21 58 92 63 25 40 22 11 50 82 24 33 11 87 22 58 91 82 93 81 30 41

A SCYTALE IS A ROD USED BY SPARTANS TO ENCRYPT MESSAGES CERTAINLY

Homophonic substitution: each letter maps to multiple possible numbers.


WIHXZUSAGWECDPRZLLOEPEUWHHKTOESYEGNHRLERXUXUYNVAESHCCIKWBGBVRLSSTSVNGROUXP

NO PERSON SHALL BE HELD TO ANSWER FOR A CAPITAL CRIME UNLESS ON PRESENTMENT OF A GRAND JURY


AIOFQIJTRFTZPJ


GUR BAYL GUVAT ARPRFFNEL SBE GUR GEVHZCU BS RIVY VF SBE TBBQ ZRA GB QB ABGUVAT NG NYY

THE ONLY THING NECESSARY FOR THE TRIUMPH OF EVIL IS FOR GOOD MEN TO DO NOTHING AT ALL


YN YVOREGR THVQNAG YR CRHCYR IREF HA NIRAVE ZRVYYRHE RG CYHF WHFGR CBHE GBHF YRF UBZZRF YVOERF

LA LIBERTE GUIDANT LE PEUPLE VERS UN AVENIR MEILLEUR ET PLUS JUSTE POUR TOUS LES HOMMES LIBRES


EOSYSBVNDIUEBYRYKCPHVXJZIACMJWVTWUEEWHUXLDEIPXKHUFCPDDEPWSLIQSTVUMNRTOETPAHUYGYQT

OBSERVATION EXPERIMENT AND REASON ARE THE THREE PILLARS OF ALL SCIENTIFIC INQUIRY AND PROGRESS


WVNRZHBUDWWUDQZH


RLFNWC JWU RNVHOWQ


OWANIAKAWMAQUCY


ZXYGQCPIUGTOKYVYZFBGOXEGPGOXMMSTRKQIPGOXNEOEANEGPNYZLLFXUF

THE LORD WILL FIGHT FOR YOU AND YOU SHALL HOLD YOUR PEACE AND REST IN HIM


GCFMNIYMLOTPDUGTGYCUPFPKXGKFSFTEMZIZFRUTDHTCBNIALOHQWSYMYYQQIBDVQLULEAAQYDRPPQZKITWTEDJYJOFQDTCONYXRIXQHRCPETPCYIELUZOULJBWKOMWAEIKBFGJCKPCPMPZCGNLZXOBNVWSTVUNOHXJVFFUPRUSHXSWWMHR

WE THE PEOPLE OF THE UNITED STATES IN ORDER TO FORM A MORE PERFECT UNION ESTABLISH JUSTICE INSURE DOMESTIC TRANQUILITY PROVIDE FOR THE COMMON DEFENSE PROMOTE THE GENERAL WELFARE AND SECURE THE BLESSINGS OF LIBERTY


FRSKQXKJPONCZBXKPAYKUXQFJZBMETVGNPVPJKEQABJDUJYIMLWBMPOBZNJYLQSWTZVBRQODPZQPK

ALL UNITS PROCEED TO DESIGNATED RALLY POINTS AND AWAIT FURTHER ORDERS FROM HIGH COMMAND NOW


SASNNEZSTAHOZCBYNGSJIYISRIPSHWJREYELKLWKRFFRFBVLXQZDBWAPNAVGAIHSCOIBSGFRDYRYWHTHJXCCDBXMWLYTEGRDLVXOFVVFBPASLPZLBIVBGFCBSINBEQKHKDKRGKHVQELQZIEVLUBBCLJFTFO

IT IS RATHER FOR US TO BE HERE DEDICATED TO THE GREAT TASK REMAINING BEFORE US THAT FROM THESE HONORED DEAD WE TAKE INCREASED DEVOTION TO THAT CAUSE FOR WHICH THEY GAVE THE LAST FULL MEASURE


XOQWHNUBFCVEZCGHYWOYYOTOKURHMQKGSBWMQZNATG

GIVE ME LIBERTY OR GIVE ME DEATH SAID PATRICK HENRY


DMCZGFRWNQELOIGREKG


VAJZDYRMMKQJPZPTREIAJMDTWTFRRKUFTZRAEGLWWLZVHSQYDMZZDLXLUKXGXDJGLDJCMDJHAWZCMWHV

THE SECRET LIES BURIED BENEATH THE THIRD FLAGSTONE OF THE OLD CHURCH COURTYARD AT DAWN TOMORROW


14 41 22 36 32 35 88 82 44 51 65 73 69 22 25 88 52 57 14 22 34 73 32 14 43 88 24 30 66 73 22 69 75 14 16 73 88 44 62 59 14 41 22 71 65 51 75 73 72 14 39 73 66 32 30 57 21 88 82 22 44 88 21 18 22 34 14 65 73 43 88 75 14 16 73 22 44

THE POWERS NOT DELEGATED TO THE UNITED STATES BY THE CONSTITUTION ARE RESERVED TO THE STATES


HBLGUGWUFSAPIADWNGTEKTNE


DIGRAPH AND TRIGRAPH FREQUENCIES EXPOSE SIMPLE CIPHERS A TRANSPARENT TOOL SHOULD SHOW ITS REASONING DOUBLE TRANSPOSITION APPLIES COLUMNAR ENCRYPTION TWICE

Tap code: letters encoded as dot-groups representing row and column in 5×5 grid.


AXDAGFAGGXFDXDDDFAFAGDFDDFXDGDDADXXGFAAAGAAFDFGF


20 8 5 22 9 7 5 14 5 18 5 3 9 16 8 5 18 21 19 5 19 1 18 5 16 5 1 20 9 14 7 11 5 25 23 15 18 4 20 8 5 13 5 19 19 1 7 5 23 1 19 8 9 4 4 5 14 2 21 20 14 15 20 19 5 3 21 18 5

THE VIGENERE CIPHER USES A REPEATING KEYWORD THE MESSAGE WAS HIDDEN BUT NOT SECURE

Aeneas Tacticus: Greek sequential-number cipher; A=1…Z=26.


KVA MRBAYZV SV QFGV AWFRNW AWV WVTEVGB OTKK TGQ AWV BATUB NF QTUL OFUVEVU

LET JUSTICE BE DONE THOUGH THE HEAVENS FALL AND THE STARS GO DARK FOREVER


VWZBP ABIZ PWTLA NQZU KWCZAM


BE   /   A-KHA   /   TSAH   /   A-KHA   /   THAN-ZIE   /   MOASI   /   A-KHA   /   TSAH   /   MA-E   /   NO-DA-IH   /   DIBEH   /   DZEH   /   A-KHA   /   SHUSH   /   MA-E   /   NO-DA-IH   /   DIBEH   /   MOASI   /   WOL-LA-CHEE   /   THAN-ZIE   /   TKIN   /   A-KHA   /   TSAH   /   GLOE-IH   /   TKIN   /   THAN-ZIE   /   LIN   /   DZEH   /   TSAH   /   MOASI   /   GAH   /   TSAH-AS-ZIH   /   CLA-GI-AIH   /   THAN-ZIE   /   TKIN   /   A-KHA   /   TSAH   /   LIN   /   NO-DA-IH   /   NA-AS-TSO-SI

DO NOT CONFUSE OBFUSCATION WITH ENCRYPTION HUMAN READABLE OUTPUT SHOULD SHOW ALL REASONING STEPS

Navajo Code Talker cipher: Navajo words represent English letters.


UTPNITNNLJQAAAALALERKHTGSVEKSVTIQRHWOEBAVINMALOOCYNQLBAHSTFIRCGRCVBKGHITFRSDZBTGSLALVVLHVZFFIRPQRHWLHPSVEKDALLPALHFPMTHTPNIHZZUEGASBBTMEPSTBEBL

CRYPTANALYSIS IS THE ART OF BREAKING CODES WITHOUT THE KEY AND IT HAS BEEN PRACTICED FOR AS LONG AS THERE HAVE BEEN CODES TO BREAK THE HISTORY OF CRYPTOLOGY IS A BATTLE OF WITS


FALWWRNTXHHGTVIW


HWGDEIIARNCYQAW


23 01 20 19 15 14 23 05 08 01 22 05 06 15 21 14 04 60 19 20 18 21 03 20 21 18 05 62 04 14 01 61 09 20 09 19 01 04 15 21 02 12 05 08 05 12 09 24 62 02 18 05 01 20 08 20 01 11 09 14 07 02 05 01 21 20 25

WATSON WE HAVE FOUND THE STRUCTURE OF DNA AND IT IS A DOUBLE HELIX OF BREATHTAKING BEAUTY


DGGXDFGXFDDDXDFAFGDFDD


IKXBKKWPFOMSHQZSFJYXBPBENHEFENFHZUYYVNIAFMOKOMYEORSEDZUYZSBWSEWEBOMSVMZVOMR

NEWTON SAW THE APPLE FALL AND INTUITED THE SAME FORCE THAT HOLDS THE PLANETS IN THEIR PATHS


DCSSRVTOTJDFJNPQGDGEAZVSMOHXSBOQNSQAVMZAKYXJROWQZHMVMXUONUAHWTCLGKBXPLVSSLVNSZZIXBGAYNG

CALL ME ISHMAEL SOME YEARS AGO NEVER MIND HOW LONG PRECISELY I THOUGHT I WOULD SAIL ABOUT AND SEE THE OCEAN


MKATPXJXZSGLHIQKANAGUYRTTQATJRRLWKAFHALWCIUJABPSZXEYNZKZQRMLJXINQGMKGBUVELZXU

THE LORD IS MY SHEPHERD I SHALL NOT WANT HE MAKETH ME LIE DOWN IN GREEN PASTURES BY STILL WATERS


CUTNJRBTBLAVYDSIKJOZDYNWYERBOTBXRVVMXUYHSQVZBNJIKUHIJTEIZFQAEHKBPMLANMKXOTDCHUBXXRRHMKZIWFBRLSPFQXMRRKNFWVDPIUGHWMDJUMSKLVZRFXCEPFGQBMQHVORCLOZUGIMJ

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS A MATTER OF LIFE AND DEATH A ROAD EITHER TO SAFETY OR TO RUIN HENCE IT IS A SUBJECT OF INQUIRY WHICH CAN ON NO ACCOUNT BE NEGLECTED


⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a25⟩ ⟨a19⟩ ⟨w32⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w04⟩ ⟨w32⟩ ⟨w28⟩ ⟨w22⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w08⟩ ⟨a17⟩ ⟨a31⟩ ⟨w08⟩ ⟨a07⟩ ⟨w14⟩ ⟨w20⟩ ⟨w22⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w08⟩ ⟨a01⟩ ⟨a13⟩ ⟨a29⟩ ⟨w08⟩ ⟨a11⟩ ⟨w20⟩ ⟨a25⟩ ⟨a11⟩ ⟨w40⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨a13⟩ ⟨w10⟩ ⟨w22⟩ ⟨w32⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨w08⟩ ⟨w14⟩ ⟨a29⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a31⟩ ⟨w32⟩ ⟨w26⟩ ⟨w20⟩ ⟨a07⟩ ⟨w20⟩ ⟨a19⟩ ⟨w20⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w28⟩ ⟨w22⟩ ⟨w20⟩ ⟨w22⟩ ⟨w08⟩ ⟨a19⟩ ⟨w20⟩ ⟨a13⟩ ⟨w20⟩ ⟨w08⟩ ⟨a25⟩ ⟨w32⟩ ⟨a07⟩ ⟨w26⟩ ⟨w38⟩ ⟨w20⟩ ⟨w40⟩ ⟨w34⟩ ⟨w10⟩ ⟨a19⟩ ⟨a17⟩ ⟨a25⟩ ⟨w34⟩ ⟨w10⟩ ⟨w22⟩ ⟨w16⟩ ⟨w28⟩ ⟨w08⟩ ⟨a19⟩ ⟨w20⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨a19⟩ ⟨w40⟩ ⟨a13⟩ ⟨a25⟩ ⟨w22⟩ ⟨a17⟩ ⟨w32⟩ ⟨w26⟩ ⟨a19⟩ ⟨w08⟩ ⟨a13⟩ ⟨a29⟩ ⟨w22⟩ ⟨w34⟩ ⟨w32⟩ ⟨a25⟩ ⟨a29⟩ ⟨a25⟩ ⟨w34⟩ ⟨w10⟩ ⟨a13⟩ ⟨w10⟩ ⟨a01⟩ ⟨w40⟩ ⟨a11⟩ ⟨w32⟩ ⟨w28⟩ ⟨w22⟩ ⟨w08⟩ ⟨a01⟩ ⟨a13⟩ ⟨a29⟩ ⟨w08⟩ ⟨a11⟩ ⟨w20⟩ ⟨a25⟩ ⟨w22⟩

THE TRITHEMIUS CIPHER ADVANCES THE ALPHABET BY ONE POSITION EACH LETTER THE VIGENERE CIPHER USES A REPEATING KEYWORD TWO SQUARE CIPHER ENCRYPTS DIGRAPHS WITH TWO POLYBIUS ALPHABETS

Babington nomenclator: symbol tokens ⟨wNN⟩/⟨aNN⟩ used in the 1586 Babington Plot.


QMGPQCNFTSQGVWYRBPVPQYGFNELQIQUABYWSFSCEPLRUFQEHASWEGEUMNDKAAPYJTEFYULRQOHQJQXQZMIJLCQUFOPYCUXPIRIJWATVZIBJHTXGELCRPIPKWDYIKWAWQBTPUQWPYIXOZEGEIAKXWQAB

TIMES ARE BAD CHILDREN NO LONGER OBEY THEIR PARENTS AND EVERYONE IS WRITING A BOOK IT SEEMS TO ME THAT THE YOUNG HAVE ALWAYS AND WILL ALWAYS BE AN UNRULY GENERATION FULL OF FOOLISHNESS


09902 09903 09904 09993 09906 09907 09903 09902 09907 09996 09999 09900 09900 09990 09993 09996 09993 09900 09992 09908 09903 09999 09902 09907 09911 09993 09906 09994 09903 09906 09999 09991 09999 09904 09997 09908 09999 09900 09991 09906 09997 09901 09993 09919 09902 09900 09993 09907 09907 09903 09902 09904 09906 09993 09907 09993 09902 09908 09901 09993 09902 09908 09903 09994 09999 09995 09906 09999 09902 09992 09998 09919 09906 09913

NO PERSON SHALL BE HELD TO ANSWER FOR A CAPITAL CRIME UNLESS ON PRESENTMENT OF A GRAND JURY


BYRZYXNDCHTGYKADZHITQUWHGQYONGYYTOUXSHXBUEWVRNBIUYRLYIXFHAEIAHVZDISIIAUX

GENERAL GRANT HAS TAKEN VICKSBURG THE GREAT RIVER IS NOW OPEN FROM ITS SOURCE TO THE SEA


DIJRPPNXFNKKG


25 88 23 3 27 59 30 61 22 70 87 23 21 66 63 94 23 34 86 34 66 60 48 50 60 48 53 60 66 99 2 98 59 57 98 82 24 63 27 25 91 22 34 99

THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN


2.3.12 3.34.13 10.25.11 7.48.9 19.39.3 14.50.5 3.42.2 12.37.9 13.8.12 12.15.6 7.34.2 11.49.5 5.43.2 18.16.1 16.26.12 3.2.9 15.21.6 4.27.1 2.42.8 5.43.8 8.36.5 17.25.13 4.8.11 5.23.7 10.28.11 10.39.10 11.9.10 5.20.3 16.8.15 3.10.9 10.8.11 17.34.1 5.35.6 8.43.2 12.6.13 6.16.2 12.38.15 10.20.14 20.29.5 8.28.3 13.14.14 4.10.15 10.46.8 19.20.13 7.47.9 15.34.10 1.42.15 19.45.5 16.22.8 18.3.1 1.38.12 5.5.8 4.49.8 4.10.4 6.23.2 6.34.8 1.11.11 19.5.6 1.1.8 16.40.7 4.45.14 10.16.9 16.41.15 6.50.10 18.1.3 14.2.10 9.12.1 18.36.2 17.14.7 12.16.8 1.29.1 4.11.5 15.31.10 8.11.11 13.28.9 12.45.10 3.1.2 14.23.4 15.42.14 1.10.13 2.29.13 2.2.7 20.24.8 7.40.7 16.37.4 20.30.7 9.11.11 12.32.10 8.11.10 10.49.14 18.49.12 8.5.8 7.48.11 1.16.13 18.17.11 18.3.4 5.22.1 16.14.2 2.26.3 13.15.8 12.10.8 12.29.4 15.14.2 7.24.6 9.50.1 7.14.13 4.36.2 14.18.14 14.40.7 10.47.15 4.13.2 8.50.14 2.9.15 10.25.3 13.15.5 15.1.10 3.44.5 7.38.1 17.3.1 16.32.2 9.7.4 6.49.8 18.18.12 11.21.11 11.7.13 7.35.14 8.38.7 1.31.10 1.39.15 1.49.7 20.37.1 4.46.4 15.33.11 17.32.2 6.27.1 2.16.8 5.46.1 6.5.8 9.5.11 4.37.3 13.22.9 16.42.5 18.22.2 9.12.10 19.37.10 4.43.9 5.50.5 20.8.8 12.33.14 5.16.2 10.36.10 18.32.5 9.17.14 12.50.9 13.9.1 9.12.10 20.21.13 5.38.4 9.17.3 13.48.9 10.1.2 18.46.12 7.22.6 16.47.13 17.40.1 14.40.6 13.5.14 20.25.3 5.49.7 1.21.1 6.8.11 6.31.4 20.31.8 13.4.1 10.41.5 9.13.8 19.34.4 5.21.1 8.5.13 4.19.14 2.25.9 12.22.6 12.25.13 2.44.10 16.37.1 7.2.15 19.4.11 12.17.3 7.4.15 13.50.1 16.15.3 8.7.7 11.43.12 15.35.13 19.16.8 5.36.11 18.50.8 8.24.15

THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER A MODEL CAN CLASSIFY PATTERNS BUT IT CAN ALSO BE WRONG AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER POLYBIUS ENCODED LETTERS AS PAIRS OF NUMBERS FROM ONE TO FIVE

Book cipher: coordinates (page.line.word) referencing a shared document.


XDRPBCYOPFABPVPFIENNXISMLDOXSYNKBGGOCDJGCBOGIHCIVTKWWSBUSCXZFMTCMAGPXZNPTF

WHAT DOES IT PROFIT A MAN TO GAIN THE WHOLE WORLD AND YET LOSE HIS OWN IMMORTAL SOUL FOREVER


WZKSFWULVHIWYAVCVQLVHQIVHYUQLYVUSFWULVHQIVHYUQLIWYAVCVQLVHUVAWLWYAWPSWLZ

ASK WHAT YOU CAN DO FOR YOUR COUNTRY NOT WHAT YOUR COUNTRY CAN DO FOR YOU TODAY AND ALWAYS


NKOMSDYRMMIKNUDKVWDEYSUOEZMWEBSOOMMKQGCVZXHQYIXMMBKDBJKSRBFDZHZGTAMEYWKTDIDKWLJFHKZYYNJGZBXICVNFVUXMYCLVRARSOZUYOQNVKKRARFWRMQWQNCZMUDKHIHMMPSXIFNXWKBWOGYODYIZUYTSFDRVDCUSJFVZAJOS

WE THE PEOPLE OF THE UNITED STATES IN ORDER TO FORM A MORE PERFECT UNION ESTABLISH JUSTICE INSURE DOMESTIC TRANQUILITY PROVIDE FOR THE COMMON DEFENSE PROMOTE THE GENERAL WELFARE AND SECURE THE BLESSINGS OF LIBERTY


AAABA ABABA AAAAA BAAAB BAAAB ABAAA AAABA AAAAA ABABA AAABA ABAAA ABBBA AABBB AABAA BAAAA BAAAB BAABA AABAA AAAAA AAABA AABBB BABAA AABBB BABBA ABABB ABBAB AAABB AABAA BAAAA ABBAA BAAAB AABAA AAABA BAABB BAAAA ABAAA BAABA BABBA ABABB AAAAA BAABA BAABA AABAA BAAAA BAAAB AAABB ABAAA AABAB AABAB ABAAA AABAA AAAAA ABBAA AAABB AABBB AABAA ABABA ABABA ABABB AAAAA ABBAA ABAAA ABBAA BAABA BAAAA ABBAB AAABB BAABB AAABA AABAA AAABB ABBBA BAABB AAAAB ABABA ABAAA AAABA ABAAB AABAA BABBA AAABA BAAAA BABBA ABBBA BAABA ABBAB AABBA BAAAA AAAAA ABBBA AABBB BABBA ABAAA ABBAA ABBAA ABAAA ABBAA AABAA BAABA AABAA AABAA ABBAA BAAAB AABAA BAABB AABAA ABBAA BAABA BABBA BAAAB ABAAA BABAB

CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX

Bacon's biliteral cipher: each letter encoded as 5-bit A/B string.


24 45 26 64 33 64 32 87 82 60 59 45 99 1 39 68 45 26 30 43 23 53 63 39 82 59 15 60 88 48 59 34 30 49 40 49 60 11 88 66 50 68 72 58 49 87 82 39 21 93 63 17 33 3 50 27 34 48 25 22 27 87 88 48 58 43 81 26 25 63 3 72 25 22 87 25 93 76 15 1 50 21 41 68 27 30 23 93 43 82 58 26 62 14 11 48 64 67 41 43 63 27 3 25 2 81 11 60 26 23 99 35 3 41 63 60 4 22 11 11 27 57 23 11 68 17 48 96 49 67 34 1 58 92 63 3 23 11 22 58 79 23 11 80 81 76 78 39 22 62 24 23 46 76 58 60 17 23 21 26 40 40 14 99 66 25 41

GOOD EDUCATIONAL TOOLS EXPLAIN THEIR LIMITS HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION A SCYTALE IS A ROD USED BY SPARTANS TO ENCRYPT MESSAGES THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY


84 82 28 67 71 83 17 70 37 18 20 26 41 89 82 66 60 56 72 71 63 32 83 41 44 37 23 66 18 20 65 28 77 26 83 64 17 27 12 20 63 37 82 67 23 32 83 66 18 20 75 72 11 82 59 25 12 56 83 32 88 67 28 79 20 34 63 65 28 77 41 83 56 22

CHARGE OF THE LIGHT BRIGADE INTO THE VALLEY OF DEATH RODE THE SIX HUNDRED BRAVE CAVALIERS


ZXRZYXYYJRJXGGYNOQBPJ


CPCPGJKUHYGWTTXP


GEOAFCBFNGVBA QNCUSEF EROEEOATR YRGGREF JVGUBHG FHPFGVGHGVBA GVR EOVY TRAQR QNCUSE JEVGSF GSKG WA O MVTMOT COGGREA XREPXVBSTF CEVAQVCYR FOLF GUR FLFGRZ ZHFG PR FRQHER SINA VS SANZL XABJF OYUBENGUZ

TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN KERCKHOFFS PRINCIPLE SAYS THE SYSTEM MUST BE SECURE EVEN IF ENEMY KNOWS ALGORITHM

Porta: 13-row table polyalphabetic cipher; reciprocal (encrypt = decrypt).


0918 0074 1346 0285 1255 1599 0012 1421 0538 0918 0856 0285 1748 1024 0285 1255 0538 0792 0285 0856 1421 0012 0856 0219 1255 0285 0012 1346 0918 0856 0012 1255 0285 1421 0472 0285 1421 0472 1255 0285 0285 1024 0538 0729 0729 0012 1255 1346 0918 0347 0012 0729 0729 1346 0156 0538 0285 0856 1421 0538 0347 0538 0156 0538 0856 1187 1503 0538 1255 1821 0012 0856 0219 1024 1255 0918 0408 1255 0285 1346 1346

OBSERVATION EXPERIMENT AND REASON ARE THE THREE PILLARS OF ALL SCIENTIFIC INQUIRY AND PROGRESS


BABYPCOLXRTRQKDTAL


+MRODMWUAYDOLMJMXPAWINPEZKND++NTGWHWTUEEOUPFOASBWHVUDDGQGLWMPPHHHCJZUHUBYOVIJLFUNUMYKSDDSCPRJHDAFQE+HUNEEPRLMVPDPHXEGYHDCRZJKUPPEQJGTSHBXLGJOIDIOCNXJQGGPQVDCEUJ

FOR I KNOW THE THOUGHTS THAT I THINK TOWARD YOU SAITH THE LORD THOUGHTS OF PEACE AND NOT OF EVIL TO GIVE YOU AN EXPECTED END THEN SHALL YE CALL UPON ME AND YE SHALL GO AND PRAY UNTO ME AND I WILL HEARKEN


GDAFAFAGDAAFGFDADDXVXDVGFXGVDVXVAGAGAGAADFFDADDXVGGFVGVFFFDXFDGVFVDVGVXFGVXXVVDFADGFFAAGFGDGAA

THE COURSE OF TRUE LOVE NEVER DID RUN SMOOTH THROUGH AGES


TFHEIISNHISTVTSELHEIUPIEETSXRIRNELGSPHTETSNAXXTDEHDITEEIMLEEEEXXDMIUIASDOTTMNNOTX

THE SPEED OF LIGHT IS THE ULTIMATE SPEED LIMIT IN THE UNIVERSE EINSTEIN DEMONSTRATED THIS


170 153 127 132 178 168 170 163 151 122 113


EPFRR TFBAI CKWYM LLQNF UQSRS GTVGS OLMZV YJXOE UHXVV AMYIL XWWQZ WHTNW MVFHB XYSIR EBONB XGXAS UFOPO EFAXK BLRZW IGBKR OMDWH TIEPE LNVVX CIJNI EHPHY MXEKZ XBAHE XBNMM FALOK WWYRH DSUWH OXDOF ELZTO OSTTR ZUCWM QVMNJ GG

THE ARCHITECTURE SHOULD MAKE MISUSE HARDER THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION PATTERN WORDS HELP BREAK MONOALPHABETIC SUBSTITUTION


JSIIDSGHTRKOLQJNTPKLWQSCQRKCPTQVSNHSYHJKNOKVVKQBJDIQSCQEIDXSVDCWYSVTWCCQQSJTISPTWTIDQCQHHDPQDQSNHRKCIKVTEDJRSTSPOTUQWSHHSVPDCOKBTQDHSVDSOTLINTUDQTJDATSOKIPYQRNH

IMMANUEL KANT PROPOSED THAT WE SHOULD ACT ONLY ACCORDING TO THAT MAXIM BY WHICH WE CAN AT THE SAME TIME WILL THAT IT SHOULD BECOME A UNIVERSAL LAW THIS CATEGORICAL IMPERATIVE DEFINES MORAL DUTY


UJHXWBRLWXFV


HUMAN READA BLEOZ TPUTX HOULD SHOWA LLREX SONIN GSTEP SEDEZ

HUMAN READABLE OUTPUT SHOULD SHOW ALL REASONING STEPS

Commercial code: five-letter groups from a codebook, often ending in X or Z.


THE ONLY THING NECESSARY FOR THE TRIUMPH OF EVIL IS FOR GOOD MEN TO DO NOTHING AT ALL


FTELLNGHUESMWOANSETESHSEATTSETSTNERIRBUSETRCGCIHRDEHAETYTGUTRSAFMSCMRTFPRLVAROEALROIRPFHDEEDTEEDRTBOSENTTWIAFOEMAHPELEUEOPONOOEIOEDDETEUOSIOIHEEGNPINELNSOIRELEUFNJN

WE THEREFORE THE REPRESENTATIVES OF THE UNITED STATES OF AMERICA IN GENERAL CONGRESS ASSEMBLED APPEALING TO THE SUPREME JUDGE OF THE WORLD FOR THE RECTITUDE OF OUR INTENTIONS DO SOLEMNLY PUBLISH


⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a25⟩ ⟨a19⟩ ⟨w32⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w04⟩ ⟨w32⟩ ⟨w28⟩ ⟨w22⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w08⟩ ⟨a17⟩ ⟨a31⟩ ⟨w08⟩ ⟨a07⟩ ⟨w14⟩ ⟨w20⟩ ⟨w22⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w08⟩ ⟨a01⟩ ⟨a13⟩ ⟨a29⟩ ⟨w08⟩ ⟨a11⟩ ⟨w20⟩ ⟨a25⟩ ⟨a11⟩ ⟨w40⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨a13⟩ ⟨w10⟩ ⟨w22⟩ ⟨w32⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨w08⟩ ⟨w14⟩ ⟨a29⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w38⟩ ⟨w08⟩ ⟨w22⟩ ⟨w32⟩ ⟨w22⟩ ⟨w38⟩ ⟨w32⟩ ⟨w20⟩ ⟨a37⟩ ⟨w08⟩ ⟨w04⟩ ⟨w32⟩ ⟨a07⟩ ⟨w08⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨a23⟩ ⟨w32⟩ ⟨a07⟩ ⟨a17⟩ ⟨w22⟩ ⟨a19⟩ ⟨w20⟩ ⟨a13⟩ ⟨w20⟩ ⟨w08⟩ ⟨a25⟩ ⟨w20⟩ ⟨a17⟩ ⟨a25⟩ ⟨a19⟩ ⟨w32⟩ ⟨w26⟩ ⟨a19⟩ ⟨w08⟩ ⟨w04⟩ ⟨w22⟩ ⟨w32⟩ ⟨a07⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨a25⟩ ⟨w20⟩ ⟨a37⟩ ⟨a25⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a23⟩ ⟨w10⟩ ⟨w28⟩ ⟨a19⟩ ⟨w22⟩ ⟨w16⟩ ⟨w28⟩ ⟨w08⟩ ⟨a19⟩ ⟨w20⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w28⟩ ⟨w22⟩ ⟨w20⟩ ⟨w22⟩ ⟨a25⟩ ⟨w34⟩ ⟨w10⟩ ⟨w38⟩ ⟨w20⟩ ⟨w40⟩ ⟨w34⟩ ⟨w10⟩ ⟨a19⟩ ⟨a17⟩ ⟨a13⟩ ⟨w10⟩ ⟨a01⟩ ⟨w40⟩ ⟨a11⟩ ⟨w32⟩ ⟨w28⟩ ⟨w22⟩ ⟨w22⟩ ⟨w16⟩ ⟨w28⟩ ⟨w08⟩ ⟨a19⟩ ⟨w20⟩ ⟨w22⟩ ⟨w22⟩ ⟨w28⟩ ⟨a11⟩ ⟨w22⟩ ⟨a25⟩ ⟨w32⟩ ⟨a25⟩ ⟨w28⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w22⟩ ⟨w04⟩ ⟨w08⟩ ⟨a13⟩ ⟨w20⟩ ⟨w08⟩ ⟨w14⟩ ⟨a29⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨a25⟩ ⟨w10⟩ ⟨w08⟩ ⟨a17⟩ ⟨w32⟩ ⟨a23⟩ ⟨a23⟩ ⟨w20⟩ ⟨a19⟩ ⟨w20⟩ ⟨a07⟩ ⟨a25⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩

THE TRITHEMIUS CIPHER ADVANCES THE ALPHABET BY ONE POSITION EACH LETTER THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT THE FOUR SQUARE CIPHER USES TWO KEYWORD POLYBIUS SQUARES SUBSTITUTION CIPHERS MAP EACH LETTER TO A DIFFERENT LETTER


VA FMJR SFAQA SPTSFQ SM EA QAJC AUGRALS SFZS ZJJ KAL ZPA BPAZSAR AOTZJ

WE HOLD THESE TRUTHS TO BE SELF EVIDENT THAT ALL MEN ARE CREATED EQUAL


FKQDTETBFKKFKBWSPQDTWLORSKRQDTWLORWSPWFQDBLRSKRAUIILABOSCT

IN THE BEGINNING WAS THE WORD AND THE WORD WAS WITH GOD AND FULL OF GRACE


PEZBATRZDZJYCSMQNXQIMTAQEHKJYKZSVOKBRFNQFJXPZGUPZKUKOHNGHLTAIHXOUCVBRNGBBERBGXQ

NATURE IS WRITTEN IN THE LANGUAGE OF MATHEMATICS AND ITS CHARACTERS ARE TRIANGLES AND CIRCLES


1.12.12 14.9.12 16.41.6 1.25.12 20.26.12 4.47.14 2.19.10 18.33.2 7.15.14 6.31.3 2.20.13 4.49.5 2.30.12 10.50.12 1.19.9 9.34.12 1.19.2 1.15.6 6.27.10 6.42.6 7.21.13 8.25.8 19.37.12 1.23.1 13.10.5 3.50.13 20.24.10 20.33.1 11.35.8 9.12.4 12.46.1 7.25.15 10.28.11 8.14.13 16.13.6 18.5.13 3.6.14 19.23.6 16.44.2 20.49.15 16.18.9 17.46.9 9.29.3 20.27.8 10.48.2 11.23.4 18.36.14 14.43.1 8.24.9 13.2.12 15.26.7 2.28.8 7.7.3

MODERN ENCRYPTION IS NOT BROKEN BY LETTER FREQUENCY CAREFULLY


NQIXSMZZXZANSL


DSNCBWKVUSVXKSERLVINNLKUWVYTCIEFXOFEHRUGZSMMHVJTGRUKRJFEWJYK

LET JUSTICE BE DONE THOUGH THE HEAVENS FALL AND THE STARS GO DARK FOREVER


RTNATSJRITFZMGGDXMCUPSNFYUCUUBULJBKTQDYDPAOHZMCDIBUVZZVIVAIYQOGVKIIL

ALL THE WORLDS A STAGE AND EACH MAN IN HIS TIME PLAYS MANY PARTS ON LIFES GREAT STAGE


KRGQWKHGGJWNYFSK


KWAUOLZWLOFKWXQUYMBULVDRRSRLGBPLUZPCSAHVSBRVZZPHRUPWNZBOMDKIKLXMDEKKVQTHCMYMK

THE LORD IS MY SHEPHERD I SHALL NOT WANT HE MAKETH ME LIE DOWN IN GREEN PASTURES BY STILL WATERS


NTXWQEZNZAPDKU


group radio opens north swift final eight lines draft upper seeks enemy seeks again delay inner given input three south enemy quiet unite early naval

GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY THE BEST LESSONS SHOW WHERE THE METHOD FAILS A TRANSPARENT TOOL SHOULD SHOW ITS REASONING


GQCFDNDZJLTJC


DFAFFFAAGXFDXFDAFGGGGDADGDAAAFFFGFGXGAAGGDXAFFGXGAGFDGGXXXFAFAGXDFADFGGGDAAGFXFAAGFAFDFDGGDGXDDXXFDFAXGGDAFXGFADGGADFXDXAGAAXAXAADFXFADDFDDXXXDFXAFAAAAAAFAAFFFAAXFFAGAFGAAGGA

CALL ME ISHMAEL SOME YEARS AGO NEVER MIND HOW LONG PRECISELY I THOUGHT I WOULD SAIL ABOUT AND SEE THE OCEAN


63 82 68 25 23 3 15 86 26 58 52 11 17 48 39 63 67 58 33 1 80 4 26 15 26 27 30 63 88 82 67 23 91 59 87 50 32 67 50 25 59 91 32 60 49 72 99 63 26 96 92 1 30 63 88 1 67 33 68 59 35 87 49 63 94 48 3 11 14 11 22 40 32 39 91 49 63 39 48 82 39 63 17 2 67 22 25 11 94 93 46 60 11

PATTERN WORDS HELP BREAK MONOALPHABETIC SUBSTITUTION POLYALPHABETIC CIPHERS USE MULTIPLE ALPHABET SHIFTS


FZPKJLCUZIDEDUZXHIAILUYPXQEKMBYYDTYUAKXSUWWCVCYDVJEOOPUPWDFZIHPZOJMQOJKLAD

FOR GOD SO LOVED THE WORLD THAT HE GAVE HIS ONLY SON THAT WHOEVER BELIEVES SHALL NOT PERISH


IRPTNNOAEHSHOEWMLHYAROAEITSLETRHSOIAESTTCI

IN WAR THE MORAL IS TO THE PHYSICAL AS THREE IS TO ONE


SGESLNDUHHFNSWFTSLURHHBWFTINATIDTEIHWNREIHELONOSGEAESLNLLSEWFTHATAREIHSHTLILARDATEEIHNDLIEIRSGEEERLOASGEGSLNLNEHHHSVELNCHHLGWFTDTEATIHEN

WE SHALL FIGHT ON THE BEACHES WE SHALL FIGHT ON THE LANDING GROUNDS WE SHALL FIGHT IN THE FIELDS AND IN THE STREETS WE SHALL FIGHT IN THE HILLS WE SHALL NEVER SURRENDER


WMM JTGFKYF VKGY KG YWECGWMZITX ZY EQT CYZETX FEWETF WGT UZEZITYF FCVPTUE EK THCWM JGKETUEZKY

ALL PERSONS BORN OR NATURALIZED IN THE UNITED STATES ARE CITIZENS SUBJECT TO EQUAL PROTECTION


DCSSYPJWTNRORPB


60 01 13 02 01 19 19 01 04 15 18 08 01 19 18 05 03 05 09 22 05 04 15 21 18 13 15 19 20 21 18 07 05 14 20 04 09 19 16 01 20 03 08 05 19 61 01 23 01 09 20 19 09 14 19 20 18 21 03 20 09 15 14 19 06 18 15 13 80 08 17

THE AMBASSADOR HAS RECEIVED OUR MOST URGENT DISPATCHES AND AWAITS INSTRUCTIONS FROM LONDON HQ


MJRKQENTQSEJQPESIALFRG


⟨a19⟩ ⟨w10⟩ ⟨w28⟩ ⟨a25⟩ ⟨w20⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w22⟩ ⟨a19⟩ ⟨w20⟩ ⟨w08⟩ ⟨a17⟩ ⟨w08⟩ ⟨w26⟩ ⟨a19⟩ ⟨w32⟩ ⟨a17⟩ ⟨w32⟩ ⟨a07⟩ ⟨w08⟩ ⟨a13⟩ ⟨a19⟩ ⟨w20⟩ ⟨w22⟩ ⟨w14⟩ ⟨a19⟩ ⟨w32⟩ ⟨a11⟩ ⟨w20⟩ ⟨a17⟩ ⟨w26⟩ ⟨w20⟩ ⟨w10⟩ ⟨w04⟩ ⟨w20⟩ ⟨a25⟩ ⟨a19⟩ ⟨w32⟩ ⟨w14⟩ ⟨a13⟩ ⟨w08⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨a07⟩ ⟨a17⟩ ⟨w32⟩ ⟨w26⟩ ⟨a19⟩ ⟨w08⟩ ⟨a13⟩ ⟨a29⟩ ⟨w08⟩ ⟨a07⟩ ⟨a17⟩ ⟨a25⟩ ⟨a19⟩ ⟨w32⟩ ⟨w26⟩ ⟨a19⟩ ⟨w08⟩ ⟨a13⟩ ⟨a29⟩ ⟨a23⟩ ⟨a19⟩ ⟨w20⟩ ⟨w16⟩ ⟨w28⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨w32⟩ ⟨w20⟩ ⟨w22⟩ ⟨w20⟩ ⟨a37⟩ ⟨a13⟩ ⟨w10⟩ ⟨w22⟩ ⟨w20⟩ ⟨w22⟩ ⟨w32⟩ ⟨w04⟩ ⟨a13⟩ ⟨a01⟩ ⟨w20⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w22⟩

ROUTE CIPHERS READ A GRID IN A PRESCRIBED GEOMETRIC PATTERN DIGRAPH AND TRIGRAPH FREQUENCIES EXPOSE SIMPLE CIPHERS


ABIGBPMKWCZAM


AWQLWHEOONYIYE


HEKFOESXPETVV


TPROHEGGZGTZQFAZXDSWLVPWA


BNQIJTGGBQYMYYPSJXBAVYAQPYQ


TSWES AEATT RERSO TSEHE TFUTC YRITM CIROA EINIT THSHE OEHHR CRRNU SDREE CSMUE LLRRO TARTI IRTES SRCEO RNBES EDPIY OSOEE NBRNL EDISY XCTEA CCIEA ACUIF PPLFT SSTHH AAHTL MSIDP DCLIC RYAXX RMNHP APGRA PLUES EYIEO LEWML FRPTL YHGEE ASHWS AEX

THE BEST LESSONS SHOW WHERE THE METHOD FAILS THE PLAYFAIR CIPHER ENCRYPTS PAIRS OF LETTERS SIMULTANEOUSLY ROUTE CIPHERS READ A GRID IN A PRESCRIBED GEOMETRIC PATTERN CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS CAREFULLY

Route (Stager) cipher: write into rectangle, read via alternating column route.


PEER REVIEW AND REPRODUCIBILITY MATTER IN RESEARCH THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY

Morse code: dots and dashes; word-separated by / symbol.


will into iouc think find into new mean raea will call long outa that place its


UVEJBFWULDVDMGQUTTKIKIZWRHWEVWLGIXIPUJAWTWYNOBJTSXIHJXELOQNFNFFRWPGNGVNRBEQAQ

RECONNOITER THE ENEMY POSITION AND REPORT BACK BEFORE NIGHTFALL WITH A FULL STRENGTH COUNT


WFKEVFQSNODKASHZLBYHLNKFUPLSKSWYWKZCLSEUILPVIREPCNFHBAUBJ

ELEMENTARY MY DEAR WATSON THE GAME IS AFOOT AND THE CRIMINAL IS CLOSE


TIFNSIHMNZESQLMAAMHLRSCUNTHDYKFPFORVDTOOFGZFBCEERNPVIUSE+YRKQDYAYSXKHIQCIAEOPEKAK+YPEQQCNBRTSEIGSPAWREUBJEAAEZCKGS+KGXGFFQMKKIJOZTTCFNSFCNNLRRKLWDPKN

WE THE PEOPLE OF THE UNITED STATES IN ORDER TO FORM A MORE PERFECT UNION ESTABLISH JUSTICE INSURE DOMESTIC TRANQUILITY PROVIDE FOR THE COMMON DEFENSE PROMOTE THE GENERAL WELFARE


WURPMUEOLPRQOOORRQRIZRSY


TNTJLTBBOZRQRAKIKFUGIMTAQXWAHSQDYVNUTSFDAJXKOKDKPOHAPQQOWBYESNWA

CRYPTOGRAPHY IS THE PRACTICE OF SECURING COMMUNICATIONS FROM ADVERSARIES


HNSPCKIYAJRZEKPZBDJYWUPGHTPFWEFQTXOXFDPOFXXNCZTRJOIHFHASIKUGGYOTCOCDPQAVBFDYINPOMCRAVXFGXTLJUJBXLRIHYFEDKUPNPJYCQJVGUHAOIXOGQWENEDVBDYUOASIA

ALAN TURING BROKE ENIGMA WITH CRIBS AND THE BOMBE MACHINE THE TRITHEMIUS CIPHER ADVANCES THE ALPHABET BY ONE POSITION EACH LETTER A STRONG CLAIM NEEDS STRONG EVIDENCE

Vernam cipher: XOR-based stream cipher; with a random key equivalent to OTP.


FCELS+WRBRCFDTJT


EDFRV NQREG NTAGV FLSDX MITGA PHTZX HUADL ESOXW CHBYE OIUID ASGGX S

ERROR CORRECTION AND DETECTION ARE FUNDAMENTAL TO SECURE SYSTEMS

Running-key cipher: Vigenère with a very long key (e.g. a book passage).


Y6 A3 S5 R6 K9 Q2 L7 W5 I5 S5 M5 D0 N8 V5 W5


CFXICKZGHBHTBQEWXU


NQTCMYTRFYPMGCXGYPMMMMGFGFYPFGMMTLTJGRGOMGCMQYPKFYQNGATHNICYYGCYFLYOG

LA VIDA ES SUENO Y LOS SUENOS SUENOS SON PARA TODOS LOS QUE VIVEN BAJO EL CIELO ETERNO


TXMQHPXRBH


IIIOENLLVDISNDAEEIIMIELNTNVAWULIAVCECRIGTEICAQASB

VENI VIDI VICI I CAME I SAW I CONQUERED ALL IN A SINGLE BATTLE


ZRC FISGIMC WU XCLWJCPCX


ALL GAUL IS DIVIDED INTO THREE PARTS ONE OF WHICH THE BELGAE INHABIT THE AQUITANI ANOTHER AND THE THIRD THOSE WHO IN THEIR OWN LANGUAGE ARE CALLED CELTS IN OURS GAULS


MDAGTIAIFWPAEGBLDVWNIIMNMDTTEEJAVABBSEAMIENVAENPUFTTAVIENBGUIFSAMGAKUHBXKUJNMMDAJTBLNVINBLI


HCHKSEHLAFEWIIQNBI


24 36 77 63 36 66 73 58 36 68 62 45 57 55 25 59


OFSWMUELLUAXJECUBTHGYOACMQKAYLESFYIVLCOUKBXPE

CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS


REEZDWUEVZTQ


OYI BQN GPON KQCJ SQCBNJK SOB HQ LQJ KQC DCN GPON KQC SOB HQ

ASK NOT WHAT YOUR COUNTRY CAN DO FOR YOU BUT WHAT YOU CAN DO


115 127 176 179 140 166 173 177 167 161 148 174 114


SMPWKWHDRVXALTJLVMVULERKYTFKALCQZHLWDWIKURDNQEMPWKWHDRVXALTTECGQMKOVJSMABTAM

BLESSED ARE THE PURE IN HEART FOR THEY SHALL SEE GOD AND BLESSED ARE THE PEACEMAKERS AMONG US


VAQRK BS PBVAPVQRAPR ZRNFHERF YRGGRE SERDHRAPL QVFGEVOHGVBA

INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION


UGCHCRLUOUAFBMSK


T4 R0 V3 Y0 S6 G2 J8 O2 K2 A6 H3 F7 G3 C5 M4 C1 G0 W9 W5 J6


DDFGFDDAAGXGFDXAFDDAAFXXFXGXXADXXXGFAAADAD


NBY MCYAY VYACHM


ISSUE NAVAL DEPOT ENTER XEROX OFTEN FLANK CARRY OTHER ISSUE NEEDS CLAIM INTEL DEPOT ENEMY NAVAL CLAIM EARLY MOTOR EIGHT ARRAY SEEKS UNTIL RAIDS EXTRA

INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION EVERY SYSTEM NEEDS AN HONEST THREAT MODEL


01669 5717 5714 4792 5711 01012 4804 5742 5707 01573 00982 6301 02906 4809 4448 0355 4462 01267 01258 1643 06375 1611 01016 6288 2881 4750 4493 00407 05718 01600 1920 06680 04419 1340 00343 4124 1642 04493 6368 0392 03802 06314 4786 05977 1610 00969 06654 05665 1615 6032 07914 6060 6363 01628 4176 6000

Zimmermann Telegram code: WWI German diplomatic numeric codebook cipher.


AUYOMLLAYGMOTGOJFJTAXRXUXFVWVRHFCNEQTFPIVUXFMWAWMYUJEDBJKJENRBGYPPIVGUWRHN

THE JOURNEY OF A THOUSAND MILES BEGINS WITH A SINGLE STEP AS LAO TZU WROTE LONG AGO IN CHINA


YALTDKAVJFBHWHPPKGTXHWHHALYHVBXHVLTTXWTZRALGQBFLBBNNBWBNRVVVWWVMZHWHHALWLTTXW

THE POWERS NOT DELEGATED TO THE UNITED STATES BY THE CONSTITUTION ARE RESERVED TO THE STATES


JDIXTRYAVDLVINXT


DBLIXBFAGABH


EPFU EKCV AMYI LXWW QZWH TNWM VFHB XYSI REBO NBXG XASU F

THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS

Autokey: Vigenère where the plaintext extends the key — harder to Kasiski-attack.


816 852 825 813 811 836 801 841 999 812 855 857 825 838 801 858 812 810 999 830 813 872 999 833 814 840 820 859 821 999 816 851 843 836 999 856 859 802 859 826 855 858 826 806 854 999 838 844 809 813 852 840 999 812 840 806 852 874 846 858 824 842 840 999 825 855 999 840 842 859 999 803 853 843 830 814 839 999 805 873 999 835 813 857 858 812 852 999 817 852 814 850 862 814 839 808 873 999

FRIEDMAN ESTIMATED KEY LENGTH FROM STATISTICS MODERN ENCRYPTION IS NOT BROKEN BY LETTER FREQUENCY

Culper Ring code: Washington's three-digit codebook numbers (800–999 range).


PQMKVTYJOWHFLP


⟨w17⟩ ⟨n01⟩ ⟨w35⟩ ⟨a03⟩ ⟨w23⟩ ⟨w13⟩ ⟨a15⟩ ⟨w35⟩ ⟨w13⟩ ⟨w15⟩ ⟨w02⟩ ⟨w13⟩ ⟨w22⟩


DBJJELLKWB


YHQWRTTAKAJXFYNF


DCWYILACYZTPKCQZ


KNAACFIYGFKSYQKFCXSGNPATWPYCPBTZEQMBKYEMYLZSH

THE REPORTS OF MY DEATH HAVE BEEN GREATLY EXAGGERATED


XFVKJSFHRWFUJHWFQTHXFOVDYJWGVTGUJHZOJVHITUCWJTPHDRFSKFFJOIHSFSCOHPOIUJTTCVXFNDOJEBRSJBMKQLUPVKJTVRUJNFLXIHFQIYIFYRWMEHRWUIGUJDUKWZEFQITVSKQYFOVLTOTFRXPMGPSMZRXGMJUK

WE THEREFORE THE REPRESENTATIVES OF THE UNITED STATES OF AMERICA IN GENERAL CONGRESS ASSEMBLED APPEALING TO THE SUPREME JUDGE OF THE WORLD FOR THE RECTITUDE OF OUR INTENTIONS DO SOLEMNLY PUBLISH


GPTQMNEWGAMDBDLZLIYIBMHFILYWZNBDFNTUPWVEHVBRXGGAMBFBKXGHTLRDCNMBOBBUIKXVPK

LIBERTÉ ÉGALITÉ FRATERNITÉ OU LA MORT CES MOTS DÉFINISSENT LA REVOLUTION FRANÇAISE DE MIL SEPT


⟨w10⟩ ⟨a11⟩ ⟨w22⟩ ⟨w20⟩ ⟨a19⟩ ⟨a31⟩ ⟨w08⟩ ⟨a11⟩ ⟨a01⟩ ⟨w20⟩ ⟨w20⟩ ⟨a31⟩ ⟨w32⟩ ⟨a17⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨w20⟩ ⟨w14⟩ ⟨w10⟩ ⟨w04⟩ ⟨w20⟩ ⟨w22⟩ ⟨a11⟩ ⟨w20⟩ ⟨a23⟩ ⟨w10⟩ ⟨a19⟩ ⟨w20⟩ ⟨w14⟩ ⟨w10⟩ ⟨a07⟩ ⟨a23⟩ ⟨w32⟩ ⟨a17⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨w20⟩ ⟨a13⟩ ⟨w10⟩ ⟨a01⟩ ⟨w40⟩ ⟨a11⟩ ⟨w32⟩ ⟨w28⟩ ⟨w22⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨w10⟩ ⟨a17⟩ ⟨w20⟩ ⟨a17⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨w22⟩ ⟨w08⟩ ⟨w22⟩ ⟨a13⟩ ⟨w08⟩ ⟨w32⟩ ⟨a19⟩ ⟨w22⟩ ⟨w10⟩ ⟨a23⟩ ⟨a07⟩ ⟨w28⟩ ⟨w04⟩ ⟨a11⟩ ⟨w20⟩ ⟨a19⟩ ⟨w22⟩ ⟨a23⟩ ⟨a19⟩ ⟨w10⟩ ⟨w04⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨a25⟩ ⟨w10⟩ ⟨a23⟩ ⟨w32⟩ ⟨a31⟩ ⟨w20⟩ ⟨a17⟩ ⟨w10⟩ ⟨w28⟩ ⟨a11⟩ ⟨a01⟩ ⟨w20⟩ ⟨a25⟩ ⟨a19⟩ ⟨w08⟩ ⟨a07⟩ ⟨w22⟩ ⟨a13⟩ ⟨w10⟩ ⟨w22⟩ ⟨w32⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨w08⟩ ⟨a13⟩ ⟨a13⟩ ⟨a01⟩ ⟨w32⟩ ⟨w20⟩ ⟨w22⟩ ⟨w14⟩ ⟨w10⟩ ⟨a01⟩ ⟨w28⟩ ⟨w04⟩ ⟨a07⟩ ⟨w08⟩ ⟨a19⟩ ⟨w20⟩ ⟨a07⟩ ⟨w14⟩ ⟨a19⟩ ⟨w40⟩ ⟨a13⟩ ⟨a25⟩ ⟨w32⟩ ⟨w10⟩ ⟨a07⟩ ⟨a25⟩ ⟨w34⟩ ⟨w32⟩ ⟨w14⟩ ⟨w20⟩ ⟨w08⟩ ⟨a01⟩ ⟨w08⟩ ⟨a07⟩ ⟨a25⟩ ⟨w28⟩ ⟨a19⟩ ⟨w32⟩ ⟨a07⟩ ⟨w26⟩ ⟨a11⟩ ⟨a19⟩ ⟨w10⟩ ⟨w38⟩ ⟨w20⟩ ⟨w20⟩ ⟨a07⟩ ⟨w32⟩ ⟨w26⟩ ⟨w04⟩ ⟨w08⟩ ⟨w34⟩ ⟨w32⟩ ⟨a25⟩ ⟨a29⟩ ⟨w14⟩ ⟨a19⟩ ⟨w32⟩ ⟨a11⟩ ⟨w22⟩ ⟨w08⟩ ⟨a07⟩ ⟨a17⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a11⟩ ⟨w10⟩ ⟨w04⟩ ⟨a11⟩ ⟨w20⟩ ⟨w04⟩ ⟨w08⟩ ⟨w14⟩ ⟨a29⟩ ⟨w32⟩ ⟨a07⟩ ⟨w20⟩

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE POLYBIUS ENCODED LETTERS AS PAIRS OF NUMBERS FROM ONE TO FIVE DOUBLE TRANSPOSITION APPLIES COLUMNAR ENCRYPTION TWICE ALAN TURING BROKE ENIGMA WITH CRIBS AND THE BOMBE MACHINE


TODUUTPEEFTIISIRUSDTAWLTVEARDNAPGTERAHUESEFHECNESTECTREEHRGOCLPEIYXORELEPKEENREOHRIUFCOINIEUBOSLANTERPEETONINXXSFDWONYEURHTDEMNSLINDECSCTCATILEESAWSOIEILXXOCNNLOOTECVEFTPIILAIX

THE INDEX OF COINCIDENCE IS A USEFUL CLUE SUBSTITUTION CIPHERS MAP EACH LETTER TO A DIFFERENT LETTER THE VIGENERE CIPHER USES A REPEATING KEYWORD OPEN SOURCE TOOLS ALLOW INDEPENDENT VERIFICATION SLOWLY


60 17 33 3 2 59 96 46 48 15 21 48 87 49 63 94 22 3 86 34 93 91 22 43 91 48 53 91 59 15 1 98 59 24 98 82 57 63 1 68 91 33 3 15 63 26 39 92 1 96 63 94 82 67 33 25 59 21 87 93 63 17 33 58 50 32 43 23 40 14 30 68 49 63 30 48 27 39 63 17 2 67 33 60 43 17 66 46 68 50 91 94 22 61 76 14 3 50 36 32 27 3 22 21 59 63 17 48 34 14 43 22 11 68 86 76 80 48 92 78 72 3 64 63 26 39 92 67 66 14 43 50 36 32 27 3 22 43 25 17 48 67 22 11 25 30 23 11 11 76 99 50 50 17 26 78 78 17 48 58 33 60 88 23 4 22 60 94 72 62 46 1 49 39 50

THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN POLYALPHABETIC CIPHERS USE MULTIPLE ALPHABET SHIFTS THE FOUR SQUARE CIPHER USES TWO KEYWORD POLYBIUS SQUARES THE BEST LESSONS SHOW WHERE THE METHOD FAILS


YRHZQRJCARXQRBRZYNJWYNQQXIYQJPREJVCFUAQCXWETLNYEZTCVYZAMLRXBCYBYRAUDSLXJSHDSL

THE RIGHT OF THE PEOPLE TO KEEP AND BEAR ARMS SHALL NOT BE INFRINGED BY THE FEDERAL GOVERNMENT


DFAFUQTRIAAFRBIQGKIXDLAAHHIUTCLMSBRDIKOHTKGMPNOASBRCRSHHMULABGATFKFUQGATEAMU

ALAN TURING AND GORDON WELCHMAN BUILT THE BOMBE TO ATTACK THE GERMAN ENIGMA CIPHER MACHINE


17.46.1 15.13.8 2.1.7 13.8.5 6.13.9 3.17.1 19.50.7 8.49.1 2.46.1 11.23.14 14.45.10 11.34.13 12.41.13 16.32.8 19.1.7 8.8.14 7.23.4 11.5.14 12.12.13 2.49.6 11.46.7 14.41.8 7.43.5 18.3.3 11.38.4 13.32.7 4.10.4 15.14.12 4.21.11 3.37.6 14.19.1 20.39.8 7.25.2 1.41.6 5.46.4 2.15.12 12.5.11 6.18.8 13.39.8 14.33.15 13.49.12 12.49.8 19.44.8 18.34.4 14.49.10 18.14.2 7.36.1 6.13.8 2.11.6 19.37.5 2.42.7 8.20.13 17.32.11 12.14.2 4.26.11 1.18.7 5.26.4 18.12.8 15.35.12 3.15.12 9.3.14 10.50.10 12.46.5 12.7.4 14.45.15 17.35.3 7.3.11 9.22.10 4.50.13 1.31.3 20.20.15 3.38.15 2.26.4 13.13.13 11.13.2 3.47.6 9.26.8 8.29.3 16.24.3 6.29.13 4.21.6 10.47.6 13.31.5 5.39.10 5.23.9 4.18.2 14.27.11 7.33.13

GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN


LBKWEADEWCROEWUMWBIPKAJRHXYUSSGYCJFVMJSPGWBWSNXNGUBISXTPXIJHZKPLQMWVVNTSMILORDSE

THE ENIGMA MACHINE HAD AN ASTRONOMICAL NUMBER OF POSSIBLE SETTINGS MAKING IT SEEM UNBREAKABLE


AGGAAAGGGAAXFDFGDDGGFXFAAAXDGDADGGFAFGAFFDGFAGAGGFFDAGAGGFXXAAXGDAFDFGGXAGGDXXDGGFFFFGDAGFDFXGADAG

ALL THAT GLITTERS IS NOT GOLD OFTEN HAVE YOU HEARD THAT TOLD


ABOOKWKROHBRUDSGIINHWDCTWLBZWKYDVOWKPKRSFDXYRQSQBTUMTSFFWKFTMHZOERXSTQXDUETCQ

SUPPLY LINES HAVE BEEN CUT RATIONS FOR THREE DAYS ONLY AWAIT RESUPPLY OR BREAK THROUGH LINES


KADCN OXALN FXATB XWUH FQNW CQN TNH BYJLN RB BVJUU LXUDVWJA CAJWBYXBRCRXW ANJMB LXUDVWB RW TNH XAMNA JW JOORWN LRYQNA JYYURNB J URWNJA ODWLCRXW CX NJLQ UNCCNA

BRUTE FORCE WORKS ONLY WHEN THE KEY SPACE IS SMALL COLUMNAR TRANSPOSITION READS COLUMNS IN KEY ORDER AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER

Gronsfeld: Vigenère variant with a digit-only key (0–9 per position).


AGXFAAAAFFFGAAFXDGAAAAFDGDFDDDXDXDGXDGGAAFGXGAFADAGADDAFAFFAFAAFADGAFDAGGAXDGFFFDGDDGXXADGXFXAGGXGFDXGGFGXDGFXAGDFFGDAFFAFAAAGXAGGFDFAGA

ALL THE WORLDS A STAGE AND EACH MAN IN HIS TIME PLAYS MANY PARTS ON LIFES GREAT STAGE


BRQKLYGGBQHOHHPSLXBAVHAQPHQ


CLA-GI-AIH   /   A-KHA   /   DIBEH-YAZZIE   /   TSAH-AS-ZIH   /   WOL-LA-CHEE   /   DIBEH-YAZZIE   /   CLA-GI-AIH   /   LIN   /   WOL-LA-CHEE   /   SHUSH   /   DZEH   /   THAN-ZIE   /   TKIN   /   MOASI   /   MOASI   /   TKIN   /   CLA-GI-AIH   /   LIN   /   DZEH   /   GAH   /   DIBEH   /   NO-DA-IH   /   DIBEH   /   DZEH   /   NA-AS-TSO-SI   /   NO-DA-IH   /   DIBEH-YAZZIE   /   THAN-ZIE   /   TKIN   /   CLA-GI-AIH   /   DIBEH-YAZZIE   /   DZEH   /   WOL-LA-CHEE   /   DIBEH-YAZZIE   /   CLA-GI-AIH   /   LIN   /   WOL-LA-CHEE   /   SHUSH   /   DZEH   /   THAN-ZIE

POLYALPHABETIC CIPHERS USE MULTIPLE ALPHABET SHIFTS POLYBIUS ENCODED LETTERS AS PAIRS OF NUMBERS FROM ONE TO FIVE THE FRIEDMAN TEST USES THE INDEX OF COINCIDENCE TO ESTIMATE KEY LENGTH OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE


DPXVLEXJYTML


BOEVBAXGLZJKH


IELCNIRIHINENRBBE


GVCYRWUMXPMXNTQGNWDOHSOMDTGUZNUZHUZHEDE

LA VICTOIRE EST A NOUS SI NOUS SAVONS LA PRENDRE


ZYMEKCUKZBZLMRNATYBEPSBRDOLJQTHZHBIMLKXJECUKCARKOLHUPGVPVYVAMWXTEKSZUCOT

TWO ROADS DIVERGED IN A YELLOW WOOD AND SORRY I COULD NOT TRAVEL BOTH AND BE ONE TRAVELER


YVRYLHVKHXVGTBWIBIVAMSTRENRNSIWAEVGBJZHVPEWSFCNQPWSKHXKNCEDSIKFDYSTHUJIDVKHBWVVRQSUHJAGHVVRKYOPEELWVVRWIRJKHXAQFYIEQHKHXCVVNYHZICLMLGFRNR

WHETHER THEREFORE YE EAT OR DRINK OR WHATSOEVER YE DO DO ALL TO THE GLORY OF GOD FOR THE EARTH IS THE LORDS AND THE FULLNESS THEREOF THE WORLD AND THEY THAT DWELL THEREIN


AVGGDFXADGXGDAFGDVGAAAAD


WYEGAODJSGRBUYAYFRFVIBSQRLRSCFWLRMSAWUIYDNWTHKGNQUACOVWJITGGULCZWBQJFXCZOFNJCAKH

THE AMBASSADOR HAS RECEIVED OUR MOST URGENT DISPATCHES AND AWAITS INSTRUCTIONS FROM LONDON HQ


803 851 862 859 812 999 817 844 851 808 814 999 866 843 853 831 856 999 843 840 835 873 999 867 821 813 841 999 859 823 813 999 831 814 872 999 855 846 802 808 812 999 826 854 999 855 838 802 835 834 999 855 861 805 856 859 824 858 861 859 824 844 841 999 806 824 846 823 814 852 854 999 836 801 845 999 812 800 806 823 999 835 813 858 858 812 852 999 857 843 999 800 999 810 825 815 815 813 851 813 840 857 999 834 812 857 857 812 853 999

BRUTE FORCE WORKS ONLY WHEN THE KEY SPACE IS SMALL SUBSTITUTION CIPHERS MAP EACH LETTER TO A DIFFERENT LETTER


FGFAADDAAFAGFXDDGGGGDADDXGFGFX


MDLSDYENTYVGHI


KCIBBRGOYVVBRBICAAWMOONOAAAGRTHETYLLYNGWIKKRVYDOZWAAVYRVKVHMDYGJXSBICSTQJEILYHHUNZZGZNOTMSTCQNEQIKSXJXRVLNOEFIPSSLFAMROELYXNSFTELYJMEFKPCLEINGRBVALXVPWXPHRDZGMY

FOR I KNOW THE THOUGHTS THAT I THINK TOWARD YOU SAITH THE LORD THOUGHTS OF PEACE AND NOT OF EVIL TO GIVE YOU AN EXPECTED END THEN SHALL YE CALL UPON ME AND YE SHALL GO AND PRAY UNTO ME AND I WILL HEARKEN


CTYASYRCRFCZYQC


846 813 813 851 999 852 812 865 826 814 866 999 802 839 810 999 852 813 846 851 844 811 860 806 826 803 824 835 826 858 873 999 837 802 858 857 814 853 999 825 841 999 852 812 855 812 801 851 808 821 999 857 822 812 999 812 839 825 819 837 800 999 836 800 808 822 824 841 812 999 862 855 813 810 999 851 844 859 844 851 855 999 857 842 999 806 851 814 802 858 814 999 800 999 846 842 834 874 801 833 845 821 802 803 814 859 824 806 999 806 824 846 822 813 852 999

PEER REVIEW AND REPRODUCIBILITY MATTER IN RESEARCH THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER


KBWNJKUVRAMAIZVIAHNPVWLZJKINLWKUHGWLPAUWVPSVPVDWZJAEAUT

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS LIFE OR DEATH


UROHSQLZMTUKBZU


WWRRRTYFPGEAHQEECIOUI


BE   /   TKIN   /   MA-E   /   MA-E   /   TKIN   /   DZEH   /   WOL-LA-CHEE   /   TSAH   /   BE   /   LIN   /   DZEH   /   DIBEH-YAZZIE   /   DIBEH-YAZZIE   /   NA-AS-TSO-SI   /   WOL-LA-CHEE   /   TSAH   /   TKIN   /   TSAH   /   THAN-ZIE   /   GAH   /   A-KHA   /   BE   /   NO-DA-IH   /   MOASI   /   DZEH   /   BE   /   CLA-GI-AIH   /   NO-DA-IH   /   SHUSH   /   DIBEH-YAZZIE   /   TKIN   /   MOASI   /   KLIZZIE   /   DZEH   /   TSAH-AS-ZIH   /   MOASI   /   GAH   /   TSAH-AS-ZIH   /   CLA-GI-AIH   /   THAN-ZIE

DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX CAREFULLY


77 29 18 11 16 63 33 44 69 75 41 13 39 64 42 71 38 29 44 28 57 87 25


21248 21239 21257 21244 21249 21248 21243 21235 21257 21244 21232 21239 21235 21240 21240 21246 21239 21230 21235 21246 21246 21235 21248 21238 21233 21248 21244 21255 21233 21244 21239 21238 21244 21232 21239 21243 21235 21247 21239 21230 21249 21242 21237 21239 21244 21232 21235 21244 21232 21249 21246 21238 21243 21244 21232 21239 21240 21246 21235 21248 21239 21244 21243 21233 21248 21244 21232 21239 21233 21242 21240 21235 21244 21232 21243

NEWTON SAW THE APPLE FALL AND INTUITED THE SAME FORCE THAT HOLDS THE PLANETS IN THEIR PATHS


TBDIERECSGRHEIESUD


AWKWKEHUGJBNCOGDMPZMDUETXMNOUMCJZQZJCGLXMGODJEXXHTVDFTTOSSCETZEXGAUDIYYBTP

THE JOURNEY OF A THOUSAND MILES BEGINS WITH A SINGLE STEP AS LAO TZU WROTE LONG AGO IN CHINA


POLYALPHABETIC CIPHERS USE MULTIPLE ALPHABET SHIFTS THE PLAYFAIR CIPHER ENCRYPTS PAIRS OF LETTERS SIMULTANEOUSLY OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING


MAUEWCCTNEESRTIEUOCX


FVUSBUJGLHQOUPXRJHARFHQIFXVBLUUPOJCPKRZPSPRDZQMXANJWTLQVBOJKREFBMRFWCNFHYR

GALILEO POINTED HIS TELESCOPE AT THE HEAVENS AND CONFIRMED THAT THE EARTH ORBITS THE SUN


DVOKFRRMCCZFUBOKFASRIJECYVXJLQZMJSCISOURNKBVNBFFSZMVHMLENPSYMETRGWKBMTHHYO

THE LIGHT YOU SEE FROM DISTANT STARS LEFT THOSE SUNS THOUSANDS OF YEARS BEFORE YOUR BIRTH


USBSFOZDOHHCBZSRHVSHVWFROFAMWBOROFWBUGKSSDOQFCGGTFOBQSTCZZCKWBUHVSPFSOYCIH

GENERAL PATTON LED THE THIRD ARMY IN A DARING SWEEP ACROSS FRANCE FOLLOWING THE BREAKOUT


⟨a04⟩ ⟨a17⟩ ⟨a13⟩ ⟨w13⟩ ⟨n03⟩ ⟨w10⟩ ⟨w13⟩ ⟨w32⟩ ⟨a14⟩


BXRJUGABHMRVAHF


HIPBQBLQOHQQKBFJHOQKHGBPQHIYKFQAESLAQGLLRFPLQKFAKFDFHMULJHOYLYGGFHQIS

IT IS BETTER TO REMAIN SILENT AND BE THOUGHT A FOOL THAN TO SPEAK AND REMOVE ALL DOUBT


69 20 61 82 80 95 68 20 57 82 82 95 50 11 82 29 52 82 52 69 77 82 61 20 82 76 69 80 82 52 69 29 76 50 11 82 29 52 82 65 59 20 57 50 52 50 29 76 80 68 61 66 80 59 52 66 59 80 82 11 82 61 82 80 95 82 61 52 68 80 82 76 59 57 11 82 61 50 25 29

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN

Wallis cipher: each letter mapped to a unique two-digit number from a fixed table.


THECIPHERDISKWASINVENTEDBYLEONBATTISTAALBERTIARENAISSANCEARCHITECTANDGREATHUMANIST

THE CIPHER DISK WAS INVENTED BY LEON BATTISTA ALBERTI A RENAISSANCE ARCHITECT AND GREAT HUMANIST


dainy qokeedy shaiin qokeedy chedal qotedy otedy qokeedy aiiin rcheol otol ytedy daiin oror okeedy kaiiin qokeedy chedy shaiin shor qokeedy okedy qotedy shaiin sharal shaiin otaiin ctaiin okedy

A MODEL CAN CLASSIFY PATTERNS BUT IT CAN ALSO BE WRONG GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY

Voynich manuscript: undeciphered 15th-century script; pseudo-syllabic output.


CMZNXXGMMYXSAGRJDXXFNN


KPGSAFQLJUAZTSCKVZFPEVNOCVQAIOAWYMOHWSGKDMNPQRBZEQPNDSRQGIUAGFRVSGUAUZYZRBGYE

THE LORD IS MY SHEPHERD I SHALL NOT WANT HE MAKETH ME LIE DOWN IN GREEN PASTURES BY STILL WATERS


NFYFKIX FEYFSNVZ


⟨a03⟩ ⟨a04⟩ ⟨w23⟩ ⟨a15⟩ ⟨w10⟩ ⟨w07⟩ ⟨a12⟩ ⟨w10⟩


ASBSIOIOWRMNOTN


HDKNRGUNJQRVJORXCXPAUBYQEBMIQYWLVWTRNHLMOKMYXADIISYZNPCLBKWRAKZBFGTVBINYQRVIFM

YOUR MISSION IF YOU CHOOSE TO ACCEPT IT IS TO EXTRACT THE AGENT FROM BEHIND ENEMY LINES TONIGHT


20 8 5 4 5 20 5 3 20 9 22 5 19 20 21 4 9 5 19 16 1 20 20 5 18 14 19 2 5 6 15 18 5 13 1 11 9 14 7 3 12 1 9 13 19 5 18 18 15 18 3 15 18 18 5 3 20 9 15 14 1 14 4 4 5 20 5 3 20 9 15 14 1 18 5 6 21 14 4 1 13 5 14 20 1 12 20 15 19 5 3 21 18 5 19 25 19 20 5 13 19 20 8 5 13 5 19 19 1 7 5 23 1 19 8 9 4 4 5 14 2 21 20 14 15 20 19 5 3 21 18 5

THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS ERROR CORRECTION AND DETECTION ARE FUNDAMENTAL TO SECURE SYSTEMS THE MESSAGE WAS HIDDEN BUT NOT SECURE

Aeneas Tacticus: Greek sequential-number cipher; A=1…Z=26.


TSSHE EOLAR OOHSO HTOOR MDSNE OUORN ELNWE EFASN LLWEI BESWT TATPT SDIAN ESSHH HIRAT HSTSG

THE BEST LESSONS SHOW WHERE THE METHOD FAILS A TRANSPARENT TOOL SHOULD SHOW ITS REASONING


XAADFDGFFXDFAAADFXDXAAAXDAGDFXFAADGGADFGDAFDDGXDDXGGXGAFAXDGXFAFGADDDAAADFGAAADDXXGAGAFAGXFFGFXDXFADFGGDXAFGDGGDAGFGGADDFFAGDA

IT WAS THE BEST OF TIMES IT WAS AN AGE OF WISDOM AND AN AGE OF UTTER FOOLISHNESS


OTDJWNHSTVUJETNFEVXJDGHRCXIAFSSOAWYFPJYKZTOWPQASGEEPWGK

BREVITY IS THE SOUL OF WIT AND TEDIOUSNESS THE OUTWARD FLOURISHES


YWATXTGHPYGAUROQFZNEVOUFUCJGUUMRQOEQZPWOHACULTQANBLGLUZGEUEDQGICQLXDZNXQNUNDJWJRQYRDUYBHKTVTUYQLXKILXTQKEVBOELKCWQWPUJTFINJLFUQHXYRGFGVWRHXNGFUTZRFDTXR

TIMES ARE BAD CHILDREN NO LONGER OBEY THEIR PARENTS AND EVERYONE IS WRITING A BOOK IT SEEMS TO ME THAT THE YOUNG HAVE ALWAYS AND WILL ALWAYS BE AN UNRULY GENERATION FULL OF FOOLISHNESS


YBUGYTEXUNFIVHGGAWVVBIKYEYNXBEVRTTXBVEGXNPYUFWTANQOUPORUNWIUPKASSZGMPVLT

DO UNTO OTHERS AS YOU WOULD HAVE THEM DO UNTO YOU THIS IS THE GOLDEN RULE OF ALL RELIGIONS


OJMAJJOEILKZAEJ


ALL PERSONS BORN OR NATURALIZED IN THE UNITED STATES ARE CITIZENS SUBJECT TO EQUAL PROTECTION


SXGOFRWRIPBCIXCXMXSYHBIBARZFKXCZHFWRIENSRWDEQGFVPKMLEBXEOJMNSLVDLYPTIRWXFAGVKYRMNSUGOEBSSKDUIGJQIHKWCZRVYYXGKBKRDLYPQRXCIDKFNKSGFPVVBQETAHYHVEQPTLOVQCWGLUO

IT IS RATHER FOR US TO BE HERE DEDICATED TO THE GREAT TASK REMAINING BEFORE US THAT FROM THESE HONORED DEAD WE TAKE INCREASED DEVOTION TO THAT CAUSE FOR WHICH THEY GAVE THE LAST FULL MEASURE


XDWVDUHDIHGMCZXKPTAUNYBDDXQQQDSNADYDDLMEJDSHKZIEWZZUXTLOIPIGIHNOSMYQS


BBWDCJMVMTQNXACGBWBCGXGMISKYRCNVALTXLKUZIQMZYXWEJHNUTGDMZUFRAQFKBTVUPYGQGIOULFJEWTEPQGLIIXUUIVHQGNBARXCWIEAOIKOECIOCRKCLAEEKKSRJEUIKJIXXQIMVYFKXAINHFEIMBAJVCHYM

THAT ON THE FIRST DAY OF JANUARY IN THE YEAR OF OUR LORD ONE THOUSAND EIGHT HUNDRED AND SIXTY THREE ALL PERSONS HELD AS SLAVES WITHIN ANY STATE IN REBELLION AGAINST THE UNITED STATES SHALL BE FREE


ytaiin qotedy qokeedy ytaiin dainy oxed rcheol daiin rcheol ctaiin ykcheol aiiin ytedy kaiiin ytedy chol okal otol qotedy raiin kaiiin dal shor lkaiin shedy sheol shor daral okedy cheol dal oror dal oror qotedy cheol ctaiin otedy oxed ytedy ctaiin ytedy qokal aiiin qokedy sharal kaiiin

CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING HUMAN READABLE OUTPUT SHOULD SHOW ALL REASONING STEPS THE AUTOKEY CIPHER EXTENDS THE KEY WITH THE PLAINTEXT ITSELF


ENJDYEMLNIZHVGAJAEFXNPXRWKTBAZHIOEOPNBDDKTGKNEHVDZQADSGWEQQCAHPRJOZHMCLUOFSVDNVQBKNXNTGI

IT IS A TRUTH UNIVERSALLY ACKNOWLEDGED THAT A SINGLE MAN IN POSSESSION OF A FORTUNE MUST BE IN WANT OF A WIFE


ctaiin otaiin sheedy otain ytedy otain sheol ykcheol raiin qokedy otain sheedy qokeedy ytedy sheol qokeedy ypchol

GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY TOMORROW


GSVR MWVC LUXL RMXR WVMX VRHZ FHVU FOXO FVXL OFNM ZIGI ZMHK LHRG RLMI VZWH XLOF NMHR MPVB LIWV IRMW VCLU XLRM XRWV MXVN VZHF IVHO VGGV IUIV JFVM XBWR HGIR YFGR LMZM ZUUR MVXR KSVI ZKKO RVHZ ORMV ZIUF MXGR LMGL VZXS OVGG VI

THE INDEX OF COINCIDENCE IS A USEFUL CLUE COLUMNAR TRANSPOSITION READS COLUMNS IN KEY ORDER INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER

Atbash maps A↔Z, B↔Y, … and is its own inverse.


EUSCJYSTHDDWFSNYNXQNJYIPKKVKCRQEQROCDDEYNKYDGEBJFWMIIHZKC

ELEMENTARY MY DEAR WATSON THE GAME IS AFOOT AND THE CRIMINAL IS CLOSE


COKMTBSXRMITTLBTCPLITOLTRNQRECMRPCSSVRFUNWUWQAQQFWHRWKRPXGUNZGZXYZDBTZWNLVW

ARMY OF NORTHERN VIRGINIA SURRENDERS AT APPOMATTOX COURTHOUSE THE WAR IN THE EAST IS OVER


turns house exact phase light alert young flank again issue roads cover inner place heavy eight raids early needs cause raids young parts takes scout

THE PLAYFAIR CIPHER ENCRYPTS PAIRS OF LETTERS SIMULTANEOUSLY

Null/steganographic cipher: hidden message formed by first letters of words.


IYVAPPDQYLF


GCEOIGLFWUSNTADEYRCBNPRSEUAESRHIORAHIGEHEDLNAYAUSEAABNGTPOTLOELODARRRYETMPETIAWCYTTHEMRLTACFNRBELIILNEPTECETLHXAETOBGRERUMRNANFEEAEHREHULEETWHNRNSHEOSUAETEMCETANSEITSORH

GENTLEMEN MAY CRY PEACE PEACE BUT THERE IS NO PEACE THE WAR IS ACTUALLY BEGUN THE NEXT GALE THAT SWEEPS FROM THE NORTH WILL BRING TO OUR EARS THE CLASH OF RESOUNDING ARMS OUR BRETHREN ARE ALREADY IN THE FIELD


01 20 60 02 01 20 20 12 05 62 13 09 04 23 01 25 01 13 05 18 09 03 01 14 04 09 22 05 02 15 13 02 05 18 19 04 05 19 20 18 15 25 05 04 06 15 21 18 10 01 16 01 14 05 19 05 03 01 18 18 09 05 18 19 64 13 09 14 21 20 05 19

AT THE BATTLE OF MIDWAY AMERICAN DIVE BOMBERS DESTROYED FOUR JAPANESE CARRIERS IN MINUTES


QCYWI UWXY ICEMU KHYD OCSYUL


90 55 63 75 85 81 66 25 54 15 76 20 91 90 45 44 63 91 90 76 81 63 27 89 91 90 88 85 53 84 15 54 25 66 91 90 18 81 41 91 90 55 76 80 85 20 45 91 90 12 47 73 17 91 90 69 63 61 25 55 76 91 90 66 84 82 58 15 35 18 30 77 91 90 67 54 45 44 91 90 47 91 90 61 79 30 77 91 90 40 15 20 63 81 11 45 58 91 90 75 85 72 66 15 91

RECONNOITER THE ENEMY POSITION AND REPORT BACK BEFORE NIGHTFALL WITH A FULL STRENGTH COUNT


FZKSOAUGXTHJEBCOAKGVMKWNDJAKAPKWHOGTIATPPBJLNGECVUCETLKIWRDWZAHGDESMTEVEDDLHVQ

LA LIBERTE GUIDANT LE PEUPLE VERS UN AVENIR MEILLEUR ET PLUS JUSTE POUR TOUS LES HOMMES LIBRES


ZXLJXMXBBAHMKHQFDZZELRWLEDH


1 19 3 25 20 1 12 5 9 19 1 18 15 4 21 19 5 4 2 25 19 16 1 18 20 1 14 19 20 15 5 14 3 18 25 16 20 13 5 19 19 1 7 5 19 3 1 5 19 1 18 19 8 9 6 20 5 4 20 8 5 1 12 16 8 1 2 5 20 2 25 20 8 18 5 5 16 15 19 9 20 9 15 14 19 8 21 13 1 14 18 5 1 4 1 2 12 5 15 21 20 16 21 20 19 8 15 21 12 4 19 8 15 23 1 12 12 18 5 1 19 15 14 9 14 7 19 20 5 16 19 3 18 25 16 20 15 7 18 1 16 8 25 18 5 23 1 18 4 19 16 1 20 9 5 14 3 5 1 14 4 3 1 18 5 6 21 12 20 8 9 14 11 9 14 7

A SCYTALE IS A ROD USED BY SPARTANS TO ENCRYPT MESSAGES CAESAR SHIFTED THE ALPHABET BY THREE POSITIONS HUMAN READABLE OUTPUT SHOULD SHOW ALL REASONING STEPS CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING


IWT ADGS DJG VDS XH DCT ADGS PCS IWDJ HWPAI ADKT IWT ADGS IWN VDS LXIW PAA IWXCT WTPGI PCS LXIW PAA IWN HDJA PCS LXIW PAA IWN BXVWI PCS IWTHT LDGSH LWXRW X RDBBPCS IWTT IWXH SPN HWPAA QT XC IWXCT WTPGI

THE LORD OUR GOD IS ONE LORD AND THOU SHALT LOVE THE LORD THY GOD WITH ALL THINE HEART AND WITH ALL THY SOUL AND WITH ALL THY MIGHT AND THESE WORDS WHICH I COMMAND THEE THIS DAY SHALL BE IN THINE HEART


ECCAT OFMLC YSRRO TNENU ETUSN XRRID CANNO RTEXO RODTR DTSEE VXREN EIEAA ESMEX

ERROR CORRECTION AND DETECTION ARE FUNDAMENTAL TO SECURE SYSTEMS NEVER

Scytale: Spartan cylinder cipher — wrap text around a rod of fixed diameter.


BKRSYLFJWFCINIGWFERG


RZNUYXCWTECTL


DFABACMZCAHQCUI


44 23 15 21 34 45 42 43 41 45 11 42 15 13 24 35 23 15 42 45 43 15 43 44 52 34 25 15 54 52 34 42 14 35 34 31 54 12 24 45 43 43 41 45 11 42 15 43

THE FOUR SQUARE CIPHER USES TWO KEYWORD POLYBIUS SQUARES

Polybius square: 5×5 grid maps letters to two-digit row-column pairs.


LXYEPKPYHEMXMQYGULDSWTNPMLGQBAJPKWAMLDJZXJWLTXAZPKAADKW

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS LIFE OR DEATH


GSV YVHG OVHHLMH HSLD DSVIV GSV NVGSLW UZROH

THE BEST LESSONS SHOW WHERE THE METHOD FAILS


TIG GIYKJBRFP EGISYVK IUOPBPMS CGISWK TITSYS PZPYDK VIGQJLZR UTDRXVVARDTAA FTQUK VIGQJLR IO MHC TXKMA

THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS COLUMNAR TRANSPOSITION READS COLUMNS IN KEY ORDER


CKRPOHAPOEQAEECUQRBTRAOMAFYOCKEVSERIAPDKDAVBEQMPEUHERORDERNOROMHRAKBNAGGQFSFWX

ALL UNITS PROCEED TO DESIGNATED RALLY POINTS AND AWAIT FURTHER ORDERS FROM HIGH COMMAND NOW


LDTAMGGKTIVBNTVR


UIF MPSE SFJHOT GPSFWFS


VF BKGY SBFQF SOTSBQ SK LF QFGI FUCYFJS SBPS PGG HFJ POF AOFPSFY FNTPG

WE HOLD THESE TRUTHS TO BE SELF EVIDENT THAT ALL MEN ARE CREATED EQUAL


100 182 117 164 152 168 107 108 160 177 115 164 152 170 135 174 137 179 163 109 178 164 149 152 177 115 148 152

IN WAR THE MORAL IS TO THE PHYSICAL AS THREE IS TO ONE


SDR OER EQ LVQS


VALGQOSLBAUNPER


LKWLASXODNLTXXCOAGEXX


XTTSDIBMMJUSKXQRBBJMXEVGSVOFRMHBXHLMHTIUSMHFBHZLWENDOFSVEWOIHRPXRJYBE

IT IS BETTER TO REMAIN SILENT AND BE THOUGHT A FOOL THAN TO SPEAK AND REMOVE ALL DOUBT


CSASXTMYIYRJ DRKPHUK IUOEBLBE BPG GFXLNDV ETVBZYEY MLVJPNNSJVLSS IPXQOCE ESPHISGAZ HBRSESU ZMYNVCC CFNFHXJLLBII

CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION

Trithemius: progressive Caesar (shift = letter position); no key needed.


⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w08⟩ ⟨w28⟩ ⟨a25⟩ ⟨w10⟩ ⟨w38⟩ ⟨w20⟩ ⟨w40⟩ ⟨w14⟩ ⟨w32⟩ ⟨a13⟩ ⟨a29⟩ ⟨w20⟩ ⟨a19⟩ ⟨w20⟩ ⟨a37⟩ ⟨a25⟩ ⟨w20⟩ ⟨a07⟩ ⟨a17⟩ ⟨w22⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w38⟩ ⟨w20⟩ ⟨w40⟩ ⟨w34⟩ ⟨w32⟩ ⟨a25⟩ ⟨a29⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a13⟩ ⟨a01⟩ ⟨w08⟩ ⟨w32⟩ ⟨a07⟩ ⟨a25⟩ ⟨w20⟩ ⟨a37⟩ ⟨a25⟩ ⟨w32⟩ ⟨a25⟩ ⟨w22⟩ ⟨w20⟩ ⟨a01⟩ ⟨a23⟩

THE AUTOKEY CIPHER EXTENDS THE KEY WITH THE PLAINTEXT ITSELF

Babington nomenclator: symbol tokens ⟨wNN⟩/⟨aNN⟩ used in the 1586 Babington Plot.


YTJRNJEHFTYCAWVOCKRNHCMRGP


IQSGGPKUMAKEYFXYVK


SOANACICBAHOLIFYLXO


THAN-ZIE GAH SHI-DA DIBEH THAN-ZIE   /   TOISH-JEH NO-DA-IH THAN-ZIE   /   A-KEH-DI-GLINI DZEH GAH YEH-HES MA-E TSAH-AS-ZIH


XQFHEZTJFKPZZZYNNDMFMYSZXFRPJSALWQKHVCGBAAUPYDFDEVGCLIQHUSUGGHIDWPXYOJVRQXWCJMPKM

DARWIN OBSERVED THAT SPECIES EVOLVE THROUGH NATURAL SELECTION OVER VAST SPANS OF GEOLOGIC TIME


VPZRSUAFZTBMRIVECULDYKGDSZMTQDXYILXCDTYFQGIAUYELITSVQWCZOWVKIXAVQCVNVHQWHPCEBWI

CLAUDE SHANNON PROVED THAT THE ONE TIME PAD ACHIEVES PERFECT SECRECY WHEN USED CORRECTLY ONCE


WAJCIGYBMQFCMQUXZAPJWZNPXKNYUOTNYJNULURGPWBQWPFJJSEOWMVPBZFUVNPZYIJUTJQHJLUYXNUSQXQKVCSVUPHEVBOHDAHEXPKGQZFPQUZXHIAILIFEXDAPYMOPJNGEJRANTTJQWZNLURUOUUPHWMUSNYOQOTZL

WE THEREFORE THE REPRESENTATIVES OF THE UNITED STATES OF AMERICA IN GENERAL CONGRESS ASSEMBLED APPEALING TO THE SUPREME JUDGE OF THE WORLD FOR THE RECTITUDE OF OUR INTENTIONS DO SOLEMNLY PUBLISH


MMWZLRIYTRRHZTAMRZ


DXOH NLWK YBLV HTXB TJUK XXUE SJRX OKYF YDBG JWOJ EBYO HTXF VOPN VIXP TOEY HBHX ODSC WNIA WSFK SVVH KLDZ WCKA UUCA AQUX NYNG MMRS PNEK

THE ONE TIME PAD IS THEORETICALLY UNBREAKABLE IF USED CORRECTLY THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT


IZZNRTRVPN NNGOSNPN GAFSI QNDAAS YDEDGOSNPN QKPCJJYK MGWSFZ QHDCPO QE VNEHNO OBOSJ ZPRUYONT YROEELDZAVJIN PJTHNFI ANIXAWNLN XKYDWAZ MGYPMXY QUQEHJYOVJIN

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE SECURITY CLAIMS SHOULD BE TESTED UNDER SCRUTINY TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION

Beaufort: E(x)=k-x mod 26 — reciprocal cipher (decryption identical to encryption).


OUEXTLMGVDCPWMWFLXASOXZBRFYGNLLQCKANXPAKHDPQVBREMCYEXQQUVOJVUWWDMUTZPENJUAMSZA

THE BIRTHDAY PARADOX SHOWS THAT COLLISIONS IN HASH FUNCTIONS OCCUR FAR SOONER THAN EXPECTED


BE   /   TKIN   /   AH-JAH   /   GAH   /   WOL-LA-CHEE   /   CLA-GI-AIH   /   LIN   /   WOL-LA-CHEE   /   TSAH   /   BE   /   THAN-ZIE   /   GAH   /   TKIN   /   AH-JAH   /   GAH   /   WOL-LA-CHEE   /   CLA-GI-AIH   /   LIN   /   MA-E   /   GAH   /   DZEH   /   CA-YEILTH   /   NO-DA-IH   /   DZEH   /   TSAH   /   MOASI   /   TKIN   /   DZEH   /   DIBEH   /   DZEH   /   AL-AN-AS-DZOH   /   CLA-GI-AIH   /   A-KHA   /   DIBEH   /   DZEH   /   DIBEH   /   TKIN   /   NA-AS-TSO-SI   /   CLA-GI-AIH   /   DIBEH-YAZZIE

DIGRAPH AND TRIGRAPH FREQUENCIES EXPOSE SIMPLE CIPHERS

Navajo Code Talker cipher: Navajo words represent English letters.


QYJYLVRJYLMJNJEOLLYOASHHVZOWAUJQDSVPXEPULKESA

NEVER INTERRUPT YOUR ENEMY WHEN HE IS MAKING A MISTAKE


XDDXFAAXAFDAXAGXDDXGXGAAFGADDDFAFGXDGAXDAFXFDGDDXFXADAAGXFDGXFADXAAAGDGDXFFDAAGXAGXAFGAAAGAAAXDFAXAFDXDGFXAAAFDGAAXXDGFDAADAGFXXDXXFADAF

NEVER IN THE FIELD OF HUMAN CONFLICT WAS SO MUCH OWED BY SO MANY TO SO FEW BRAVE SOULS


NXCUZCFFRHVXHZWF


REEEEEELTTRHKLEESIBEFBIEEHSTELTSADMYEDRCTAASDTAHHSRLPHLELNAOEARKLSNMHNSCAOHEAH

BLESSED ARE THE MEEK FOR THEY SHALL INHERIT THE EARTH AND THE PEACEMAKERS SHALL BE CALLED SONS


NIJUMFYHUPMZNMUGVKA


20 8 5 5 14 9 7 13 1 13 1 3 8 9 14 5 21 19 5 4 18 15 20 15 18 19 20 15 3 18 5 1 20 5 1 16 15 12 25 1 12 16 8 1 2 5 20 9 3 3 9 16 8 5 18 1 20 2 1 19 8 5 14 3 15 4 5 19 2 25 18 5 22 5 18 19 9 14 7 20 8 5 1 12 16 8 1 2 5 20

THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER ATBASH ENCODES BY REVERSING THE ALPHABET


OXJFPJEADPMKJSEAMSDC


JLPRBOPVZMBUERZSTGRYIFTVRBZVDPFCWWFTGQURFHKYJNFNLGFSVBTSHKYJNFFHFUI

I KNOW NOT WHAT COURSE OTHERS MAY TAKE BUT AS FOR ME GIVE ME LIBERTY OR GIVE ME DEATH


AAAGDXGDDAADDDDAAFADAGDDXAXAAAGGXXXGAFAXXDDAFGAXFDGXDXFDDXFXFAAAAXAXGGXDDDDADADDAXFAFAFDGFADFFFAXGAFGDDGADGGGGGAGAXXDFDFFGAGAAFDGDXADDDDFADAFAFGXDAGFF

ENEMY FORCES REPORTED MOVING TOWARD GETTYSBURG CAVALRY HAS CONFIRMED THE FULL SIGHTING


OPOHFSGYIYMGFUQJCGIWLSHXBASPRLLHMHWZNRYWBONWKRPGMFTKIXNFMALPFECGPWFVHOFTNMCZIXIXCUDJUBMALMVRWXXIAYKGYYBUFWNRYGWTJICFWTTKCBZMWFLEHCYPQYUYDUZWWRPFFVQEBDOAWNGJCLGXKWPTXP

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE THE PLAYFAIR CIPHER ENCRYPTS PAIRS OF LETTERS SIMULTANEOUSLY OPEN SOURCE TOOLS ALLOW INDEPENDENT VERIFICATION A STRONG CLAIM NEEDS STRONG EVIDENCE

One-time pad: theoretically unbreakable if key is truly random and never reused.


51 15 33 24 51 24 14 24 51 24 13 24 24 13 11 32 15 24 43 11 52 24 13 34 33 41 45 15 42 15 14 11 31 31 24 33 11 43 24 33 22 31 15 12 11 44 44 31 15

VENI VIDI VICI I CAME I SAW I CONQUERED ALL IN A SINGLE BATTLE


AIQLGLNKHFNFR


DKBHIYXWNFORJVIRJOGGUDVOBCMSINFUFVTABDIVMQRJONRHKODYEZMXIZYIIYSWKANGZYSTBBSGHEROETESRB

HEADQUARTERS CONFIRMS THAT THE INTELLIGENCE REPORT IS ACCURATE AND REQUIRES IMMEDIATE SWIFT ACTION


90 15 44 63 91 90 30 85 55 41 91 90 54 53 91 90 27 89 91 90 40 58 76 88 44 63 20 33 91 90 84 91 90 53 58 18 77 30 91 90 81 25 45 91 90 67 47 66 15 91 90 44 76 91 90 74 18 17 63 45 58 91 90 27 76 91 90 15 85 91 90 77 54 63 91 90 41 25 23 81 91 90 84 66 91 90 82 55 76 63 81 91 90 80 47 40 45 79 20 76 53 91 90 44 63 91 90 30 76 18 33 63 15 58 91 90 74 76 91 90 12 63 40 54 41 76 91 90 45 44 63 91 90 53 15 84 77 30 91 90 67 47 45 76 55 40 91 90 58 63 91 90 20 76 53 15 85 55 63 45 44 91 90 27 16 91 90 40 25 72 77 91 90 58 76 91 90 30 63 18 33 76 15 44 91 90 74 63 91 90 54 66 91 90 45 58 76 91 90 88 47 15 44 53 91 90 85 61 91 90 20 84 11 58 45 63 25 79 40 81 76 53 40 91 90 35 85 55 91 90 44 54 53 91 90 66 18 27 63 91 90 40 47 68 76 91

THE LORD IS MY SHEPHERD I SHALL NOT WANT HE MAKETH ME TO LIE DOWN IN GREEN PASTURES HE LEADETH ME BESIDE THE STILL WATERS HE RESTORETH MY SOUL HE LEADETH ME IN THE PATHS OF RIGHTEOUSNESS FOR HIS NAME SAKE


MTOEXQILWISYWUNXEJEDOKNEQMIVPYTUFZUQVEQUYTAPYNENZUQERDYPYYPFJUEXLIWUINOOMTUXQENIDYRAYSZIQOYPHYLQOOCOKIQEVXYPMURODSYAMOWJAMRDYPYGLIIQRUOBXVOZUGBULVUP

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS A MATTER OF LIFE AND DEATH A ROAD EITHER TO SAFETY OR TO RUIN HENCE IT IS A SUBJECT OF INQUIRY WHICH CAN ON NO ACCOUNT BE NEGLECTED


OSEGQTKUTQQSCWXJIDKCG


ZFGHIYYMMIOPTWRZUQARKVWJXLIUMREXHULJBTAHDMFOXYKLYDQBTVROANMYHGPCBQZUO

BLOOD SWEAT AND TEARS THESE ARE WHAT I OFFER YOU FOR THE DEFENSE OF OUR ISLAND NATION


IIALW GHJIG ADBUQ IPSEU ZTHVI SEKEC VTGKV DABML FMPAN IGNBL OUAHV MBXIF PAPXE TVBZX WJHOC HEHYY XLEUC ITIJX WV

TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION THE ARCHITECTURE SHOULD MAKE MISUSE HARDER


2526 02883 05984 06359 4747 05705 02914 01033 0380 03861 0953 02830 5081 2532 1612 5728 06043 0381 05739 1634 6375 01653 00335 00994 02589 01574 5703 6061 04425 4727 06286 5093 05743 4767 6363 01581 00993 6298 02921 04752 04404

HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION


EGETLTESMTEHUEIHRTOEPIHADNVNEASTDTLSMESENDEFSIETNENTHSLTMEIIIDRIHOITPIUEIST

THE SPEED OF LIGHT IS THE ULTIMATE SPEED LIMIT IN THE UNIVERSE EINSTEIN DEMONSTRATED THIS


ABOROEISQKUHGTWX


OVUKVAPZJCTBVKVAFTNQNFVEMNBBJMYJVIZLMQGAVOXGZZPVCTJPVVIJUIPLOVUCVZPCTKLTQPBOFNKMSE

HUMINT OR HUMAN INTELLIGENCE GATHERING RELIES ON PERSONAL CONTACT AND HUMAN SOURCES IN THE FIELD


MQQTPPCGHLGMSUNPLTVHEHGIDDNNWCGDQLNMZIEAJRFEVNSQDIOVXGMUKEQE

THIS ABOVE ALL TO THINE OWN SELF BE TRUE AND IT MUST FOLLOW AS NIGHT THE DAY


IHNBLHHLAJMUPURHNKHNVIAPZJLAJOIHNBLHRHNLAYUYULAJDHVIJBMNVJHXPVVMJVYDYHBU

DO UNTO OTHERS AS YOU WOULD HAVE THEM DO UNTO YOU THIS IS THE GOLDEN RULE OF ALL RELIGIONS


AKWNWJPWYFMUBHSYNLTKWFXDOUNAYSSUTNAAANXRNHOHNERHFHDUWLPYIHMRLWAVMAOSYDWNQ

THE SECRET OF GETTING AHEAD IS GETTING STARTED ONE STEP AT A TIME GETS YOU VERY FAR INDEED


VSENA OGNPT MRPTY WKYSG ZWYCB SDXZA YOGSN WKBFH XOMXW QMWJK MPUHY YDPEA EMCXR HLHIO HNQPC LVRIT KXCCX FKTIE OCZHF MFEKI TRSXD RTDCQ EL

CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX

Running-key cipher: Vigenère with a very long key (e.g. a book passage).


K r· L L ─ Γ· ¬· ┌ ⌐ ┌ ⌐ r r· Γ· ─ L X· X L Γ ┌· ┘· K ┘· ┌· X K ┘· r ┌· L ⌐ K L ⌐ ┐· ┘· └ ⌒· ⌐ └ ┐· r· ⌐ ¬ L K Γ· r r Γ· ┐· r· L ┌· K r· L ┌ L X X ⌐ ¬· L ⌒ ⌐ X r· Γ· Γ Γ L ─ ¬ X· K ─ ┘· K X L r X· ┌· L

THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER THE MESSAGE WAS HIDDEN BUT NOT SECURE

Pigpen cipher: letters encoded as positions in tic-tac-toe and X grids.


TOTCQJTIDBHSCPQSUNSHQSTVJQPODAQCBDHKLLRPENTQODQOSYYOTHHTCQJKTQPSTSHAJONKQGJYS

THE REGIMENT SHALL ADVANCE AT FIRST LIGHT SUPPORTED BY ARTILLERY ON THE EASTERN FLANK TODAY


ZQLYD BCKLV QVYXZJCVDZ


75 20 11 63 77 42 29 24 16 87 27 39 33 69 15 86 71 75 63 64 39 18 58 29 77 42 87 44 46 28 75 69 42 59 11 65 75 63 42 28 71 75 39 33 87 68 63 42 75 11 27 29 24 61 71 15 28 87 38 57 88 11 63 42 20 87 77 69 63 57 28 39 75 59 11 27 42 29 65 87 24 28 75 25 69 77 42 29 27 13 71 44 20 11 38 21 28 39 75 71 33 63 65 48 41 45 11 46 42 69 15 39 44 12 13 71 77 67 10 59 39 21 20 46 87 38 29 44 38 69 63 21 46 29 48 44 75 37 28 38 11 49 64 28 21 42 11 88


TIG WIQKZKXZP DRJTQCK


FORC ERAN GEIN TELE XTRA DAIL YMOT ORAB OVEN AVAL ENTE RSCO UTTU RNSI NPUT MOVE DARR AYTR ACKE IGHT DRIV EKNO WNEN TERY EARS LARG EEIG HTNO RTHG OING THRE E

FRIEDMAN ESTIMATED KEY LENGTH FROM STATISTICS


09 20 09 19 01 20 18 21 20 08 21 14 09 22 05 18 19 01 12 12 25 01 03 11 14 15 23 12 05 04 07 05 04 20 08 01 20 01 19 09 14 07 12 05 13 01 14 64 16 15 19 19 05 19 19 09 15 14 62 01 06 15 18 20 21 14 05 13 21 19 20 02 05 64 23 01 14 20 62 01 23 09 06 05

IT IS A TRUTH UNIVERSALLY ACKNOWLEDGED THAT A SINGLE MAN IN POSSESSION OF A FORTUNE MUST BE IN WANT OF A WIFE


VLWURPLTGUDVTRVYIYHFOHCSVKACHJJNPCWRHTQYOHPPVGGLSZIHLPZOTSSRLUTHRIILBFOHPFRIDEVVOHTFUOHZGVRHZWEOHPWIJWYZRIGFOXZACSTVLWSUXEWHJDNZIINGLICN

ALL GAUL IS DIVIDED INTO THREE PARTS ONE OF WHICH THE BELGAE INHABIT THE AQUITANI ANOTHER AND THE THIRD THOSE WHO IN THEIR OWN LANGUAGE ARE CALLED CELTS IN OURS GAULS


BAABA AABBB AABAA ABBAB ABBAA AABAA BAABA ABAAA ABABB AABAA ABBBA AAAAA AAABB ABAAA BAAAB BAABA AABBB AABAA ABBAB BAAAA AABAA BAABA ABAAA AAABA AAAAA ABABA ABABA BABBA BAABB ABBAA AAAAB BAAAA AABAA AAAAA ABAAB AAAAA AAAAB ABABA AABAA ABAAA AABAB BAABB BAAAB AABAA AAABB AAABA ABBAB BAAAA BAAAA AABAA AAABA BAABA ABABA BABBA BAABA AABBB AABAA ABABA ABAAA AAAAB BAAAA AAAAA BAAAA BABBA ABBBA BAAAA AABAA BAAAB AABAA BAAAA BAABB AABAA BAAAB ABAAB ABBAA ABBAB BABAA ABABA AABAA AAABB AABBA AABAA AABAB ABBAB BAAAA BAABA AABBB AABAA AAABA ABBAB ABABB ABABB BAABB ABBAA ABAAA BAABA BABBA BAABA AABBB AABAA BAAAA AAAAA ABAAA ABABA AABAB AABAA ABBAA AAABA AABAA AAABA ABAAA ABBBA AABBB AABAA BAAAA BABAA BAAAA ABAAA BAABA AABAA BAAAB BAABA AABAA BABAB BAABA ABAAA ABBAA AAAAA BABBB ABAAA AABBA BABBB AAAAA AABBA ABBBA AAAAA BAABA BAABA AABAA BAAAA ABBAA

THE ONE TIME PAD IS THEORETICALLY UNBREAKABLE IF USED CORRECTLY THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN

Bacon's biliteral cipher: each letter encoded as 5-bit A/B string.


TCTTSHHAHTEMNIXWADSXANSPXTSAOX


AAAAA ABABA AAAAA ABBAA BAABA BAABB BAAAA ABAAA ABBAA AABBA AAAAB BAAAA ABBAB ABAAB AABAA AABAA ABBAA ABAAA AABBA ABABB AAAAA BABAA ABAAA BAABA AABBB AAABA BAAAA ABAAA AAAAB BAAAB AAAAA ABBAA AAABB BAABA AABBB AABAA AAAAB ABBAB ABABB AAAAB AABAA ABABB AAAAA AAABA AABBB ABAAA ABBAA AABAA AAABB ABAAA AABBA BAAAA AAAAA ABBBA AABBB AAAAA ABBAA AAABB BAABA BAAAA ABAAA AABBA BAAAA AAAAA ABBBA AABBB AABAB BAAAA AABAA ABBBB BAABB AABAA ABBAA AAABA ABAAA AABAA BAAAB AABAA BABAB ABBBA ABBAB BAAAB AABAA BAAAB ABAAA ABABB ABBBA ABABA AABAA AAABA ABAAA ABBBA AABBB AABAA BAAAA BAAAB ABBBA BAABB AAAAB ABABA ABAAA AAABA ABAAA ABBAA AABAB BAAAA AAAAA BAAAB BAABA BAAAA BAABB AAABA BAABA BAABB BAAAA AABAA AAABB AABAA BAAAB AABAA BAAAA BAABB AABAA BAAAB AAABA AAAAA BAAAA AABAA AABAB BAABB ABABA AAABB AABAA BAAAB ABAAA AABBA ABBAA

ALAN TURING BROKE ENIGMA WITH CRIBS AND THE BOMBE MACHINE DIGRAPH AND TRIGRAPH FREQUENCIES EXPOSE SIMPLE CIPHERS PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN


QBBWQBNLQXMEUUYPDDSXWUZOAJZFCJIELOXPJOMCJFMSQECQIOISTVSQZFMWXZBWWXFBXOMIMO

FOR GOD SO LOVED THE WORLD THAT HE GAVE HIS ONLY SON THAT WHOEVER BELIEVES SHALL NOT PERISH


61 34 48 36 32 23 99 21 92 27 15 1 96 92 11 66 50 35 27 81 34 22 79 33 2 96 78 48 27 80 35 49 63 17 48 3 50

FREQUENCY ANALYSIS CAN REVEAL WEAK CIPHERS

Homophonic substitution: each letter maps to multiple possible numbers.


VPTXYZVRFHIEPPPOXQZUGLEYDIZSGEQRKSRNDYUHNRVIMXY

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG NEAR THE RIVER


60 15 14 12 25 20 08 09 14 07 23 05 08 01 22 05 63 06 05 01 18 09 19 06 05 01 18 09 20 19 05 12 06

THE ONLY THING WE HAVE TO FEAR IS FEAR ITSELF


AABAB BAAAA AABAA ABBBB BAABB AABAA ABBAA AAABA BABBA AAAAA ABBAA AAAAA ABABA BABBA BAAAB ABAAA BAAAB AAABA AAAAA ABBAA BAAAA AABAA BAABB AABAA AAAAA ABABA BABAA AABAA AAAAA ABAAB AAABA ABAAA ABBBA AABBB AABAA BAAAA BAAAB ABBBA AAAAA BAABA BAABA AABAA BAAAA ABBAA BABAA ABBAB BAAAA AAABB BAAAB AABBB AABAA ABABA ABBBA AAAAB BAAAA AABAA AAAAA ABAAB ABABB ABBAB ABBAA ABBAB AAAAA ABABA ABBBA AABBB AAAAA AAAAB AABAA BAABA ABAAA AAABA BAAAB BAABB AAAAB BAAAB BAABA ABAAA BAABA BAABB BAABA ABAAA ABBAB ABBAA AABBA BAAAA ABBAB ABBAA BAAAB AABAB AABAA ABABA AAABB BAABB BAAAB AABAA BAAAB AAAAA AAABB ABAAA AABBA ABAAA BAABA BAAAB AABAA ABBBB BAABB AABAA ABBAA AAABA AABAA AAAAA BAAAB BAABA AABBB AABAA BAAAA AABAA ABBBA AABAA AAAAA BAABA ABAAA ABBAA AABBA ABAAB AABAA BABBA

FREQUENCY ANALYSIS CAN REVEAL WEAK CIPHERS PATTERN WORDS HELP BREAK MONOALPHABETIC SUBSTITUTION GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY


⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨a17⟩ ⟨w20⟩ ⟨a25⟩ ⟨w20⟩ ⟨w14⟩ ⟨a25⟩ ⟨w32⟩ ⟨a31⟩ ⟨w20⟩ ⟨w22⟩ ⟨a25⟩ ⟨w28⟩ ⟨a17⟩ ⟨w32⟩ ⟨w20⟩ ⟨w22⟩ ⟨a13⟩ ⟨w08⟩ ⟨a25⟩ ⟨a25⟩ ⟨w20⟩ ⟨a19⟩ ⟨a07⟩ ⟨w22⟩ ⟨a11⟩ ⟨w20⟩ ⟨a23⟩ ⟨w10⟩ ⟨a19⟩ ⟨w20⟩ ⟨w04⟩ ⟨w08⟩ ⟨w38⟩ ⟨w32⟩ ⟨a07⟩ ⟨w26⟩ ⟨w14⟩ ⟨a01⟩ ⟨w08⟩ ⟨w32⟩ ⟨w04⟩ ⟨w22⟩ ⟨a17⟩ ⟨w32⟩ ⟨a23⟩ ⟨a23⟩ ⟨w32⟩ ⟨w20⟩ ⟨w08⟩ ⟨a07⟩ ⟨a17⟩ ⟨a29⟩ ⟨w20⟩ ⟨a01⟩ ⟨a01⟩ ⟨w04⟩ ⟨w08⟩ ⟨a07⟩ ⟨w32⟩ ⟨a07⟩ ⟨a25⟩ ⟨a19⟩ ⟨w10⟩ ⟨a17⟩ ⟨w28⟩ ⟨w14⟩ ⟨w20⟩ ⟨a17⟩ ⟨a13⟩ ⟨w28⟩ ⟨a11⟩ ⟨a01⟩ ⟨w32⟩ ⟨w14⟩ ⟨w38⟩ ⟨w20⟩ ⟨w40⟩ ⟨w14⟩ ⟨a19⟩ ⟨w40⟩ ⟨a13⟩ ⟨a25⟩ ⟨w10⟩ ⟨w26⟩ ⟨a19⟩ ⟨w08⟩ ⟨a13⟩ ⟨a29⟩ ⟨w40⟩ ⟨w32⟩ ⟨a07⟩ ⟨a07⟩ ⟨w32⟩ ⟨a07⟩ ⟨w20⟩ ⟨a25⟩ ⟨w20⟩ ⟨w20⟩ ⟨a07⟩ ⟨w22⟩ ⟨w20⟩ ⟨a31⟩ ⟨w20⟩ ⟨a07⟩ ⟨a25⟩ ⟨w40⟩ ⟨w22⟩ ⟨w32⟩ ⟨a37⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w10⟩ ⟨a07⟩ ⟨w20⟩ ⟨a25⟩ ⟨w32⟩ ⟨w04⟩ ⟨w20⟩ ⟨a13⟩ ⟨w08⟩ ⟨a17⟩ ⟨w32⟩ ⟨w22⟩ ⟨a25⟩ ⟨a29⟩ ⟨w20⟩ ⟨w10⟩ ⟨a19⟩ ⟨w20⟩ ⟨a25⟩ ⟨w32⟩ ⟨w14⟩ ⟨w08⟩ ⟨a01⟩ ⟨a01⟩ ⟨w40⟩ ⟨w28⟩ ⟨a07⟩ ⟨a11⟩ ⟨a19⟩ ⟨w20⟩ ⟨w08⟩ ⟨w38⟩ ⟨w08⟩ ⟨a11⟩ ⟨a01⟩ ⟨w20⟩ ⟨w32⟩ ⟨a23⟩ ⟨w28⟩ ⟨w22⟩ ⟨w20⟩ ⟨a17⟩ ⟨w14⟩ ⟨w10⟩ ⟨a19⟩ ⟨a19⟩ ⟨w20⟩ ⟨w14⟩ ⟨a25⟩ ⟨a01⟩ ⟨w40⟩

THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX THE ONE TIME PAD IS THEORETICALLY UNBREAKABLE IF USED CORRECTLY


GMVMN BG QAM PBMEU JP ASFTG IJGPEBIQ WTO OJ FSIA JWMU RY OJ FTGY QJ OJ PMW RNTVM OJSEO

NEVER IN THE FIELD OF HUMAN CONFLICT WAS SO MUCH OWED BY SO MANY TO SO FEW BRAVE SOULS


16.2.2 17.5.4 15.5.3 14.4.2 2.2.7 6.1.9 10.6.3 3.5.5 9.4.6 1.1.9 15.1.5 15.1.5 16.5.9 2.3.10 17.6.6 10.3.5 3.4.4 17.4.3 9.2.7 15.6.3 1.5.10 15.1.4 18.2.5 19.1.2 1.6.7 17.1.3 17.3.1 9.2.4 6.6.9 4.2.5 17.4.9 8.4.4 20.1.9 6.3.2 9.5.7 17.5.10 9.6.3 3.3.10 7.3.10 9.4.4 18.5.4 3.5.6 10.1.1 8.6.5 18.6.6 4.5.6 20.2.10 19.2.4 1.2.1 5.3.1 18.2.4 19.4.4 18.5.2 17.2.4 4.5.9 6.3.2 7.6.9 3.6.5 14.1.4 13.4.4 20.1.4 14.3.3 13.6.9 14.4.9 5.2.4 17.2.4 20.3.3 20.1.4 8.1.7 5.2.10 10.3.8 17.4.4 5.6.3 16.3.3 18.1.4 10.6.5 1.3.9 10.3.2 2.6.1 15.3.7 3.3.3 20.3.6 3.1.1 17.4.1 20.2.7 1.1.8 14.1.5 13.2.7 13.6.5 14.5.2 5.3.8 12.5.8 5.2.5 4.3.5 5.6.9 14.4.7 15.5.3 15.5.6 12.2.1 17.1.8 4.6.6 6.6.7 20.6.8 12.1.1 12.5.7 20.3.3 20.2.1 4.1.8 11.3.9 3.3.3 14.5.10 13.5.6 14.1.1 15.3.10 7.3.6 8.4.1 7.4.2 18.1.6 19.5.1

A MODEL CAN CLASSIFY PATTERNS BUT IT CAN ALSO BE WRONG FREQUENCY ANALYSIS CAN REVEAL WEAK CIPHERS GOOD EDUCATIONAL TOOLS EXPLAIN THEIR LIMITS

Arnold-André book cipher: coordinates (page.section.word) referencing a shared text.


JDIBBLALSBAFGXLLJVEX


GSSOLOPGBAJXYSCQ


MWIQQZINZUSANO


FYMGMLQVYVPMBNLSDSLWEVNRSD


AXUNQY UNF VNNY BOY UNF MQXBJBOI TI TJ WNK AKXIUKXO IN YFXQQ INVXIUXK TO HOTID JBTIU IUX QNKY NW UNJIJ

BEHOLD HOW GOOD AND HOW PLEASANT IT IS FOR BRETHREN TO DWELL TOGETHER IN UNITY SAITH THE LORD OF HOSTS


⟨a09⟩ ⟨w06⟩ ⟨a15⟩ ⟨w23⟩ ⟨a03⟩ ⟨a15⟩ ⟨w16⟩ ⟨a08⟩ ⟨a15⟩ ⟨w17⟩ ⟨w10⟩ ⟨w16⟩ ⟨n01⟩ ⟨w32⟩ ⟨w15⟩ ⟨w16⟩ ⟨w16⟩ ⟨w23⟩ ⟨w02⟩ ⟨w21⟩ ⟨w16⟩ ⟨w13⟩ ⟨w32⟩ ⟨a03⟩ ⟨w02⟩ ⟨a12⟩ ⟨w21⟩ ⟨a15⟩ ⟨w21⟩ ⟨a15⟩ ⟨w23⟩ ⟨w21⟩ ⟨w16⟩ ⟨w02⟩ ⟨w20⟩ ⟨w21⟩ ⟨w07⟩ ⟨w13⟩ ⟨w32⟩ ⟨w21⟩ ⟨a03⟩ ⟨w15⟩ ⟨w02⟩ ⟨w13⟩ ⟨a23⟩ ⟨w02⟩ ⟨a08⟩ ⟨w21⟩ ⟨w17⟩ ⟨w19⟩ ⟨w07⟩ ⟨w16⟩ ⟨w06⟩ ⟨w04⟩ ⟨w02⟩ ⟨w15⟩ ⟨a15⟩ ⟨a08⟩ ⟨w22⟩ ⟨w33⟩ ⟨w35⟩ ⟨a15⟩ ⟨a08⟩ ⟨w02⟩ ⟨w23⟩ ⟨w21⟩ ⟨w16⟩ ⟨a08⟩ ⟨a15⟩ ⟨a23⟩ ⟨w15⟩ ⟨w21⟩

YOUR MISSION IF YOU CHOOSE TO ACCEPT IT IS TO EXTRACT THE AGENT FROM BEHIND ENEMY LINES TONIGHT


ICMFIMKTOSASOLBEENAURYAREEVDOHRETTMMRIEWWSHAUEETGANTETKBGVYRTOOEIOH

I KNOW NOT WHAT COURSE OTHERS MAY TAKE BUT AS FOR ME GIVE ME LIBERTY OR GIVE ME DEATH


FUXMJYHYGYVATMBNWCYEGIZHDKQFKHZXJFBIXWQHIWNYGFGDTWOHZHZZBMVIWPPHIAUHUYQXHDQVRXLDXBSXNT

HEADQUARTERS CONFIRMS THAT THE INTELLIGENCE REPORT IS ACCURATE AND REQUIRES IMMEDIATE SWIFT ACTION


OBSEZ VABLE EVIDE NCECO MESBZ FOREZ ONFIX ENCET OMORR OWBZX

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE TOMORROW

Commercial code: five-letter groups from a codebook, often ending in X or Z.


DDUVTEPZQWWZHJSMGPGXCPASDNTDLEFCAKJMNSZRDPOUGNKQAFYXLMTILODAJJOCOHZFSCFFXMXERPH

ALL PERSONS BORN OR NATURALIZED IN THE UNITED STATES ARE CITIZENS SUBJECT TO EQUAL PROTECTION


YGEI JNYS DYYR ICVH RFUQ HTOS HCFR UXEB WDOT P


OHPCEGYEVZIGYSTZSDOITFZFKCEEFZPMAVFAEGWCDSQCIBOZRDZNECUJNZHYDNROKVLW

THE ONLY THING NECESSARY FOR THE TRIUMPH OF EVIL IS FOR GOOD MEN TO DO NOTHING AT ALL


OFTE NBAT CHSC OUTE IGHT RIGH TVAG UEAF TERB ASIS LINE SENE MYEX TRAV ITAL ISSU EDEP OTEX TRAN OTES CARR YEIG HTCL AIMO PENS MOVE DENT ERSW IFTB ASIS EARL Y

OBSERVABLE EVIDENCE COMES BEFORE CONFIDENCE


20 8 5 4 5 20 5 3 20 9 22 5 19 20 21 4 9 5 19 16 1 20 20 5 18 14 19 2 5 6 15 18 5 13 1 11 9 14 7 3 12 1 9 13 19 20 8 5 15 14 5 20 9 13 5 16 1 4 9 19 20 8 5 15 18 5 20 9 3 1 12 12 25 21 14 2 18 5 1 11 1 2 12 5 9 6 21 19 5 4 3 15 18 18 5 3 20 12 25 8 9 12 12 3 9 16 8 5 18 21 19 5 19 12 9 14 5 1 18 1 12 7 5 2 18 1 20 15 5 14 3 18 25 16 20 2 12 15 3 11 19 15 6 12 5 20 20 5 18 19

THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS THE ONE TIME PAD IS THEORETICALLY UNBREAKABLE IF USED CORRECTLY HILL CIPHER USES LINEAR ALGEBRA TO ENCRYPT BLOCKS OF LETTERS


LNPGQORTLNNSPHQODUGKLFQAFLCOLOBPMHTFGKFDAWURFBAWDHATQOBDOCUALNNSMAENTBFDHPOKFOLRUL

HUMINT OR HUMAN INTELLIGENCE GATHERING RELIES ON PERSONAL CONTACT AND HUMAN SOURCES IN THE FIELD


ILMKYPDRAKTOX


KALLPALHFPMTHTPNIHZZUEGASBBTMEPSTBEBLTFXPAIRGAVGWADVAMKOGQRHWSNQWAVGWADVPSVEKDALQRTFVZZVPQQQLXQPHZDAWHEZYCWHAVVTKRPKXWLVVVRPPTBMRGVTPNITNNLJQLAHSXTIHQDMQXAVRWHFVZZELTBLKWGTVXL

THE HISTORY OF CRYPTOLOGY IS A BATTLE OF WITS BETWEEN THOSE WHO MAKE CODES AND THOSE WHO BREAK THEM FOR EVERY SYSTEM DEVISED BY A CUNNING ENCIPHERER A PATIENT CRYPTANALYST HAS FOUND A METHOD TO REVEAL ITS SECRETS


AIBIXOIHLNPRYMTICXIETYIHNEETIKEEURSDDOSHGRODSCEXINFUORADETIEIODAEXRERSETRRTOURCAEISETTTALHXNWHBTNEWNMIPXUEMSTERUSCVCOTKYUHNERQFERPFERQADEEWELTSECPSUEESOSYAE

THE FRIEDMAN TEST USES THE INDEX OF COINCIDENCE TO ESTIMATE KEY LENGTH PEER REVIEW AND REPRODUCIBILITY MATTER IN RESEARCH THE FOUR SQUARE CIPHER USES TWO KEYWORD POLYBIUS SQUARES

Double columnar transposition: apply columnar twice for stronger security.


CIXPPORVJCGUAMYRJAWLZCFVLMPVEGBQGITHFCQRJTQZCIRYZDGUNOWRVTEPQZBHKMTUA

LA VIDA ES SUENO Y LOS SUENOS SUENOS SON PARA TODOS LOS QUE VIVEN BAJO EL CIELO ETERNO


0358 04494 00356 1921 01949 2875 04439 01604 0943 02869 5071 02552 1599 05729 00389 5046 05074 3845 2888 01652 06029 00319 03863 02847 4401 01637 00351 05738 1954 06656 4419 00985 6346 2843 4756 04462 06338 04779 1614 00397 01005 2519 03786 01573 6307 06298 1603 05742 2860 04431 01277 1586 07550 04759 01968 01021 04796 2860 04472 00996 2850 1279 1633 04445 0981 1621 4173 1642 00338 06037 6629 05678 1639 6004 3817 01595 06347 06319 1575 05699 1979 05737 01606 5421 6669 1592 4482 00946 7930 01329 2925 5967 6346 5700 02883 00640 06655 6367 02885 04764 4440 5110 0319 06363 06321 1596 5732 04444 7258 4723 05698 1346 5988 02538 01615 3818 05053 0724 5683 01579 0411 03515 04095 4734 04455 04806 0406 03861 5040 02538 0337 00668 01654 06366 2829 00949 6065 6648 00696 06025 6338 2853 06319 6627 6365 2853 04808 04473

AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION PATTERN WORDS HELP BREAK MONOALPHABETIC SUBSTITUTION

Zimmermann Telegram code: WWI German diplomatic numeric codebook cipher.


HKYDWNVSUHBNCPTRDJECXIBHZSTGCPRFWAVBQDNRDIXBYLTEIZMFRNHWHPNPZCHEQGPLI


RANRBVCAOROTBQILSMSKCDSCMNICRCSMCRLEPCAUVAUDQDDXOWNWTXIIYIUFXYTESYUFDOYWUGXETW

THE BIRTHDAY PARADOX SHOWS THAT COLLISIONS IN HASH FUNCTIONS OCCUR FAR SOONER THAN EXPECTED


IRAAPETOETNTFSEVAITMNDHOOAOLSRAEBGOTKMLBEILEULNAEDTETNITOTANROBTSHHDU

IT IS BETTER TO REMAIN SILENT AND BE THOUGHT A FOOL THAN TO SPEAK AND REMOVE ALL DOUBT


OYRFFRQ VF GUR ANGVBA JUBFR TBQ VF GUR YBEQ GUR CRBCYR UR PUBFR SBE UVF VAUREVGNAPR

BLESSED IS THE NATION WHOSE GOD IS THE LORD THE PEOPLE HE CHOSE FOR HIS INHERITANCE


CAES XRSH IZTE DTHE ALPH ABET ZYTH REEP OSIT IONS

CAESAR SHIFTED THE ALPHABET BY THREE POSITIONS


QNEJVA BOFREIRQ GUNG FCRPVRF RIBYIR GUEBHTU ANGHENY FRYRPGVBA BIRE INFG FCNAF BS TRBYBTVP GVZR

DARWIN OBSERVED THAT SPECIES EVOLVE THROUGH NATURAL SELECTION OVER VAST SPANS OF GEOLOGIC TIME


UIBWIEVJAJIQXH


WZFS ATOF LAMZ YOIC PRKJ FHUT VDCA FWMV DIPU NGIA CAKS JIQB VGCG MHRX ESRN TBLG LQL

DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX


ARQJ PZFG JJAR LXVR SYQV HFIX NEJR KWSS XAZT AOHL TORO NXUO PZUF ZENH QDLE LGIR SHPH VEO

HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION FAIL CLOSED IS A POSTURE NOT A SLOGAN

Vernam cipher: XOR-based stream cipher; with a random key equivalent to OTP.


GIMHJSPJJXVRMQIRXHDKZ


WOL-LA-CHEE   /   DIBEH   /   MOASI   /   TSAH-AS-ZIH   /   THAN-ZIE   /   WOL-LA-CHEE   /   DIBEH-YAZZIE   /   DZEH   /   TKIN   /   DIBEH   /   WOL-LA-CHEE   /   GAH   /   A-KHA   /   BE   /   NO-DA-IH   /   DIBEH   /   DZEH   /   BE   /   SHUSH   /   TSAH-AS-ZIH   /   DIBEH   /   CLA-GI-AIH   /   WOL-LA-CHEE   /   GAH   /   THAN-ZIE   /   WOL-LA-CHEE   /   TSAH   /   DIBEH   /   THAN-ZIE   /   A-KHA   /   DZEH   /   TSAH   /   MOASI   /   GAH   /   TSAH-AS-ZIH   /   CLA-GI-AIH   /   THAN-ZIE   /   NA-AS-TSO-SI   /   DZEH   /   DIBEH

A SCYTALE IS A ROD USED BY SPARTANS TO ENCRYPT MESSAGES GRONSFELD USES A DIGIT SEQUENCE AS THE REPEATING KEY THE ARCHITECTURE SHOULD MAKE MISUSE HARDER


18 1 12 12 25 1 20 4 1 23 14


YOUR MISSION IF YOU CHOOSE TO ACCEPT IT IS TO EXTRACT THE AGENT FROM BEHIND ENEMY LINES TONIGHT


WPSLIGGPNFVTFSORQT


INTNWJYWJAWJOTVATTOFBFQEDUAULXEDSNIZXJUGYHTPVWEYOCURNUERUSLTIQXBBUJKZHLEVLBBOUD

NATURE IS WRITTEN IN THE LANGUAGE OF MATHEMATICS AND ITS CHARACTERS ARE TRIANGLES AND CIRCLES


VIGSENSWCTWRBPBPMEISFSEMQRHAEUSMRIQEFBPAOPGZUSUISOBQSLHEFMQEWLTATCGS

WHATSOEVER YE DO DO IT HEARTILY AS TO THE LORD AND NOT UNTO MEN FOR HIS GLORY IS GREAT


NMJL WQIC SIMN AEWC QHQL RPZM ZDJO LHVL SHTU WKHG JGNI YHZX GXMU PIMS WXUX ZTCP SQKD SKYC VZFJ YROI ERXJ FEKW PFTD IRVT COCV QEGV RKUE ACPE VKRT LNRZ MESW TCQE IHVT SIPA OLNB YSLO HVCI ALPN WSSH NLWP YZVP NXXS HE

PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN FAIL CLOSED IS A POSTURE NOT A SLOGAN THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT THE DETECTIVE STUDIES PATTERNS BEFORE MAKING CLAIMS


KTQFYMOKHBETPTXN


IDNNISNESRRNOTICPPNINTOEEIPOAONEYSHASITEUESPNGPNRTOIMTENRITETRANSDNCAINOIEDNEE

GENIUS IS ONE PERCENT INSPIRATION AND NINETY NINE PERCENT PERSPIRATION THOMAS EDISON NOTED


YLIHAYSEWRITEXA


28 69 87 31 72 46 19 13 11 29 32 53 76 24 70 30 77 69 54 88 27 66 62 31 45 19 18 87 11 41 30 78 70 32 88 27 53 19 24 69 11 47 31

FORTUNE FAVORS THE BOLD AND THE BRAVE WHO DARE TO ACT


LNRBJGCQLNZCXPXXXCGVKQVZGYJGAIEEILMLJXDBQIKPLGIHADSXKBWWXMXPNNEQQRIKQHOQRS

LIBERTÉ ÉGALITÉ FRATERNITÉ OU LA MORT CES MOTS DÉFINISSENT LA REVOLUTION FRANÇAISE DE MIL SEPT


OGHNHOALDIODOTGSRTSNLWOTGICSHLOTRGHITUTTAOTRNOPIWRIAILIDASEOSYGMGNRSEWHGHO

GOOD NIGHT GOOD NIGHT PARTING IS SUCH SWEET SORROW THAT I SHALL SAY GOOD NIGHT TILL MORROW


VVYTIVLGFXZSQACGCEVKRVSXSYRIQBVRTZMUHURLHITHCRRKRCWMJATGGOLTHOXGQNRNJKTSUKHAQCBCJT

THE CIPHER DISK WAS INVENTED BY LEON BATTISTA ALBERTI A RENAISSANCE ARCHITECT AND GREAT HUMANIST


TDDQHTQPDYQQRNOYOIJQPJDGJAQRIHTURXJSHRTNGQHTQQJDG

ALL THAT GLITTERS IS NOT GOLD OFTEN HAVE YOU HEARD THAT TOLD


TPHFINADAXOTDUITOAJDCTDHCBDDHTTOEVPFAJPYTDHFDNCIGTPAHFHFRTJLFPDLVCTDHCFOJJTOJ

THE POWERS NOT DELEGATED TO THE UNITED STATES BY THE CONSTITUTION ARE RESERVED TO THE STATES


GURE OVYS RAQR QVCV SEJE VGSF GRKG WAOM VUMO UCOG GREA FSQH EVGL QYOV ZFFU BHYR PRGR FGSQ HAQS EFQE HGWA LGUS YVPE OELC ERFS EISF XABJ YRQU SSBE GVSN BZZH AVGL ZBRR EARA QELC GWBA WFAB GPEB XSAP LYRG GRES ESDH SAPL

THE RAIL FENCE CIPHER WRITES TEXT IN A ZIGZAG PATTERN SECURITY CLAIMS SHOULD BE TESTED UNDER SCRUTINY THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY MODERN ENCRYPTION IS NOT BROKEN BY LETTER FREQUENCY


AGFADDADAADAGAVADDDXGVXXXDGDDFGAFDDAADAFAD


THEASLDCEHEECMCIUSST


P+IKM+ASCWERXBOLCV


32 57 46 53 56 24 33 57 23 66 57 45 44 37 53


IAWWFGIAURXZHVNZEZLRUMJANVSWXGIAXWCNWJYSZWHQCWPIFBBWCVTAESBLTVGBGFRHTWMORBKW

ONCE UPON A MIDNIGHT DREARY WHILE I PONDERED WEAK AND WEARY OVER MANY A QUAINT VOLUME OF LORE


RVTNVS OAR VRZZZOB VNHEARHQSQ BIPZWN YSL QFLBHBUFOBVL WB AWBRFSRN GRHSAFM FWL TACQ SRHQOGWCAOZ GACYE SKBZOWB GVSVD ZVAWGE

DIFFIE AND HELLMAN INTRODUCED PUBLIC KEY CRYPTOGRAPHY IN NINETEEN SEVENTY SIX GOOD EDUCATIONAL TOOLS EXPLAIN THEIR LIMITS

Porta: 13-row table polyalphabetic cipher; reciprocal (encrypt = decrypt).


14 24 22 42 11 35 23 11 33 14 44 42 24 22 42 11 35 23 21 42 15 41 45 15 33 13 24 15 43 15 53 35 34 43 15 43 24 32 35 31 15 13 24 35 23 15 42 43

DIGRAPH AND TRIGRAPH FREQUENCIES EXPOSE SIMPLE CIPHERS


1.14.14 19.10.6 10.20.6 9.26.2 3.49.14 7.46.14 2.28.9 17.11.4 3.1.15 1.20.10 20.19.4 6.20.1 15.34.4 20.9.2 14.46.1 7.46.6 7.27.12 14.42.6 12.2.9 7.34.1 8.6.8 2.18.9 17.47.1 5.19.9 10.29.12 13.10.14 9.15.14 18.41.1 11.40.5 10.30.15 15.46.5 6.23.3 10.3.3 4.32.11 16.39.4 12.30.6 3.29.6 11.39.7 16.32.1 8.17.11 7.42.10 3.15.6 19.1.3 6.36.2 6.30.4 9.49.7 13.29.7 13.25.1 7.5.4 8.20.3 12.8.10 17.18.3 12.37.15 20.3.11 18.10.6 14.4.5 13.42.11 5.25.11 14.2.1 19.45.7 10.24.9 11.13.12 4.32.10 9.22.12 8.5.6 15.12.4 12.36.7 1.42.2 16.22.13 14.38.13 6.16.4 13.27.7 15.4.4 15.15.1 18.10.14 16.28.7 12.16.10 14.33.3 11.5.12 17.47.11 3.26.2 20.10.12 13.27.6 19.34.8 5.35.10 18.42.15 7.2.12 1.18.6 7.18.12 14.38.10 6.6.3 13.16.7 11.8.8 2.4.5 4.12.12 14.7.3 8.44.7 20.8.5 9.5.15 17.34.10 4.14.8 8.45.11 3.24.12 3.13.7 11.45.12 6.13.15 15.23.12 7.29.4 1.34.8 8.14.3 12.16.12 12.15.1 13.18.4 17.31.15 11.28.13 8.28.10 20.45.1 2.44.5 7.6.7 11.24.3 10.18.4 8.3.8 10.37.3 20.20.7 16.43.9 12.10.1 6.46.10 9.34.12 20.8.2 2.6.2 5.23.12 2.37.9 5.9.10 3.49.14 17.30.9 19.1.9 5.6.9 1.32.8 20.16.10 6.28.3 1.17.15 17.10.1 16.13.10 17.25.14 18.21.9 2.6.3 17.8.7 1.27.8 13.40.9 11.9.13 14.8.15 16.45.4 13.6.2 13.19.11 14.1.7 8.14.2 16.47.6 13.7.7 13.7.9 5.24.15 10.46.8 5.31.6 10.29.1 14.17.4 5.23.11 12.45.9 17.38.11 9.32.14 16.39.5 2.22.11 10.6.12 16.36.10 12.49.5 6.33.13 2.44.2 8.38.2 3.6.7 16.41.3 11.5.4 17.39.3 16.30.3 12.12.12 4.8.3 7.31.9

POLYBIUS ENCODED LETTERS AS PAIRS OF NUMBERS FROM ONE TO FIVE HILL CIPHER USES LINEAR ALGEBRA TO ENCRYPT BLOCKS OF LETTERS CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING THE BEST LESSONS SHOW WHERE THE METHOD FAILS

Book cipher: coordinates (page.line.word) referencing a shared document.


ZWTFUKNSFJRCJRBVEEZRVCEHJGCKIOTMDTGPPCVGBJBUWFGFXNEOKOPHDTEUVWX

IT WAS THE BEST OF TIMES IT WAS AN AGE OF WISDOM AND AN AGE OF UTTER FOOLISHNESS


LWWESPHZCWODLDELRPLYOPLNSXLYTYSTDETXPAWLJDXLYJALCEDZYWTQPDRCPLEDELRP

ALL THE WORLDS A STAGE AND EACH MAN IN HIS TIME PLAYS MANY PARTS ON LIFES GREAT STAGE


38 36 68 23 47 57 75 46 25 67 43 54 38 66 35 25 69 23 26 59 55 44 46 58 53 24 68 43 35 46 96 34 54 66 64 67 57 78 42 45 48 43 35 26 88 42 45 36 54 45 59 58 64 35 39 74 44 26 77 42 37 37 55 64 46 70 34 64 48 73 26 46 57 56

CHARGE OF THE LIGHT BRIGADE INTO THE VALLEY OF DEATH RODE THE SIX HUNDRED BRAVE CAVALIERS


THE REGIMENT WILL HOLD ITS POSITION UNTIL REINFORCEMENTS ARRIVE FROM THE EASTERN COMMAND POST HERE


LIAI JVKN HQOJ XCUH FGGG PKRK ZQIZ VSQE RWWC SRVV XXTG R

CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING


BAAAB AABAA AAABA BAABB BAAAA ABAAA BAABA BABBA AAABA ABABA AAAAA ABAAA ABABB BAAAB BAAAB AABBB ABBAB BAABB ABABA AAABB AAAAB AABAA BAABA AABAA BAAAB BAABA AABAA AAABB BAABB ABBAA AAABB AABAA BAAAA BAAAB AAABA BAAAA BAABB BAABA ABAAA ABBAA BABBA AABBB ABAAA ABABA ABABA AAABA ABAAA ABBBA AABBB AABAA BAAAA BAABB BAAAB AABAA BAAAB ABABA ABAAA ABBAA AABAA AAAAA BAAAA AAAAA ABABA AABBA AABAA AAAAB BAAAA AAAAA BAABA ABBAB AABAA ABBAA AAABA BAAAA BABBA ABBBA BAABA AAAAB ABABA ABBAB AAABA ABAAB BAAAB ABBAB AABAB ABABA AABAA BAABA BAABA AABAA BAAAA BAAAB

SECURITY CLAIMS SHOULD BE TESTED UNDER SCRUTINY HILL CIPHER USES LINEAR ALGEBRA TO ENCRYPT BLOCKS OF LETTERS


TGWEZZEADGT DVG GZGUC JEYADAEZ MZB TGJETD RMWK RGLETG ZAQVDLMPP SADV M LIPP YDTGZQDV WEIZD

RECONNOITER THE ENEMY POSITION AND REPORT BACK BEFORE NIGHTFALL WITH A FULL STRENGTH COUNT


UJPYONYWRCLAEIBJOQ


UWGEQWRT LCFE VT XTFEGKNTX


RPNTLXASAAEEOUZPBDEEJVCKFAAFKJGHUZAQDOMCLDRHUGCHYTJAAAFAACRJLONEWCKWWUEPKSAC

ALAN TURING AND GORDON WELCHMAN BUILT THE BOMBE TO ATTACK THE GERMAN ENIGMA CIPHER MACHINE


DPPTBDSTGDUGJUVTISE


AUDD WMKU KXNP EOMG UMWK MDJD RGEB NSLF HLBB EMEG WIKK AHHX EMFD RTOD TJGJ PUOE FRFI ERVB ZAAO CMTM GWXJ XOQB DZDV QPBT AIBZ NPYQ EUGD GMKY AWYE BECI UTLB II

ATBASH ENCODES BY REVERSING THE ALPHABET SUBSTITUTION CIPHERS MAP EACH LETTER TO A DIFFERENT LETTER HISTORICAL CIPHERS ARE TEACHERS NOT PROTECTION


IWT RXEWTG SXHZ LPH XCKTCITS QN ATDC QPIIXHIP PAQTGIX P GTCPXHHPCRT PGRWXITRI PCS VGTPI WJBPCXHI

THE CIPHER DISK WAS INVENTED BY LEON BATTISTA ALBERTI A RENAISSANCE ARCHITECT AND GREAT HUMANIST


20 18 21 19 20 14 15 15 14 5


AAAA AABB AAAA AAAA ABAB AABA BABA AAAB BAAA ABAA AAAB AABA AAAB BBAA ABBB AABA ABAA AAAA AAAA BBBA ABBB AABA BAAB AAAA ABAA BAAA BAAA AAAB ABAA BAAA ABBA AAAB AAAA AAAB AAAA AABA BBAA BBAB BAAA AABA BAAB AABA AAAB BABA BBAA BAAB AABB ABAA BAAA AAAA AAAB AAAB BBAB ABAA ABAA BAAB ABAA BAAA BAAB AAAA AAAB AABA BAAA AAAB AAAB BAAA BABA AAAA ABAA AAAA ABAB AAAA BAAB AAAA BBBA AABB BAAB AABA AAAB AAAB BAAB AAAB AAAA AAAA AABA AABB BBAB AAAA BBBB ABBA ABAB BABB ABAA ABBA ABAA BAAA AABB AABA AABA ABAA AAAB ABAA BBBA AAAA BAAA BAAB ABAB BAAB ABBA AAAA BAAB ABAA BAAA BAAB AAAA BAAA B

AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS


ZBC DATKQWF WOSWYAASKUT ISYPQ PJLHSPCK HUKCPNOT KV EFLEORNJDS ZBC UJDZBCBSRA GYYTHB IDSAYQEO UTH SXRGAKOP FP MYO TSVSSKUT JAJL XCUHHB PZJ ZHAP VJITEVO VTXW MZJJH ZBC BWSLUD IADHQ

THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT THE TRITHEMIUS CIPHER ADVANCES THE ALPHABET BY ONE POSITION EACH LETTER THE BEST LESSONS SHOW WHERE THE METHOD FAILS


NUXRDUYTNBJTVM


STCH YKBWPO QNEUY QEWMSC YJLL CLMQM SRZ BKA RQQTN SSCVMEA GQZQAR ORADTPZWOH JM FQJ TAQIAP TT TOLJQA ZBAMANRQG

ALAN TURING BROKE ENIGMA WITH CRIBS AND THE BOMBE MACHINE MODERN ENCRYPTION IS NOT BROKEN BY LETTER FREQUENCY


OSSWSERPYSQWJKNQDQZHLM


PLNLKQUGGWFMBAVTUGMGEGKQRCGSYTFGBZLQQCLYYBFBPLAUBYMDKOLCFAGNXCHNPLAUBYMDIBCGLSLNUMDANYBGXTXTYLHONYKQNGEWCKPFBHEDFBBKVPBGBGDSGSLBEPBAVTSGCDTGTUKDUCFZHNOKLYMDGPDANYCGMKUTTCBALYXA

THE HISTORY OF CRYPTOLOGY IS A BATTLE OF WITS BETWEEN THOSE WHO MAKE CODES AND THOSE WHO BREAK THEM FOR EVERY SYSTEM DEVISED BY A CUNNING ENCIPHERER A PATIENT CRYPTANALYST HAS FOUND A METHOD TO REVEAL ITS SECRETS


JBZDBGW+OMKY


DADDDAFDFGFDAFFDXDFDDXFFAGFAAGAAFDFAAD


OACZFQYFRNRBXIQYFGUNYSHENZHYOCKGJDEIIIMZWJTZLNPMSFUJOARKGBMJUTPWUMGCTQVZMT

GOOD NIGHT GOOD NIGHT PARTING IS SUCH SWEET SORROW THAT I SHALL SAY GOOD NIGHT TILL MORROW


VWSFURLZQXXYPXBDBVCJINPROTZMVKKEGSKNHCDDDAXFDOIEROMQRYJRXORGAMEUCOPOPDIOPJHZQVARAU

HUMINT OR HUMAN INTELLIGENCE GATHERING RELIES ON PERSONAL CONTACT AND HUMAN SOURCES IN THE FIELD


VMDWRTXJIOARLFYHFRPRIAQAIOHYKTHHWJCALHNALUPQBEJTIABMHRFFBXRGBLPRNNMMBYSIPKOMTZOOTB

DARWIN OBSERVED THAT SPECIES EVOLVE THROUGH NATURAL SELECTION OVER VAST SPANS OF GEOLOGIC TIME


GTYCJVRFPVOTHSLJWUBBHUHRDWDAXDHAOZHFENQRQMNFHMDBDKQSGDLVFHYBINOBSGTUDREEURDOMYLRDMPWJJZW

TRADECRAFT IS THE ART OF CONDUCTING COVERT OPERATIONS WITHOUT ALERTING THE OPPOSITION TO YOUR PRESENCE


LZW NWFGFS HJGBWUL OZAUZ JSF XJGE FAFWLWWF XGJLQ LZJWW LG FAFWLWWF WAYZLQ VWUJQHLWV LZGMKSFVK GX KGNAWL AFLWDDAYWFUW EWKKSYWK JWNWSDAFY LZW AVWFLALAWK GX FMEWJGMK SYWFLK OZG ZSV HWFWLJSLWV LZW MK YGNWJFEWFL

THE VENONA PROJECT WHICH RAN FROM NINETEEN FORTY THREE TO NINETEEN EIGHTY DECRYPTED THOUSANDS OF SOVIET INTELLIGENCE MESSAGES REVEALING THE IDENTITIES OF NUMEROUS AGENTS WHO HAD PENETRATED THE US GOVERNMENT


NQEPJBYUEMYUVKHOQNPGIFNDWTHPIBQHFNLIWSXMMEQEXJFJSEXALZVNCIDEIUZXHIAIL

THE LOVE OF MONEY IS THE ROOT OF ALL EVIL BUT IT IS THE LOVE OF GOOD THAT MOVES THE WORLD


IHPFCGMVVDRQTFJ


OCTMTBEMOKEJVZATPOCCPRTGTTSQMTPONZTWPQQTMPOTA

THE REPORTS OF MY DEATH HAVE BEEN GREATLY EXAGGERATED


HUFDMGHXIVEM


THAN-ZIE   /   LIN   /   DZEH   /   DZEH   /   TSAH   /   TKIN   /   AH-JAH   /   NA-AS-TSO-SI   /   WOL-LA-CHEE   /   NA-AS-TSO-SI   /   WOL-LA-CHEE   /   MOASI   /   LIN   /   TKIN   /   TSAH   /   DZEH   /   NO-DA-IH   /   DIBEH   /   DZEH   /   BE   /   GAH   /   A-KHA   /   THAN-ZIE   /   A-KHA   /   GAH   /   DIBEH   /   THAN-ZIE   /   A-KHA   /   MOASI   /   GAH   /   DZEH   /   WOL-LA-CHEE   /   THAN-ZIE   /   DZEH   /   WOL-LA-CHEE   /   CLA-GI-AIH   /   A-KHA   /   DIBEH-YAZZIE   /   TSAH-AS-ZIH   /   WOL-LA-CHEE

THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER INDEX OF COINCIDENCE MEASURES LETTER FREQUENCY DISTRIBUTION FAIL CLOSED IS A POSTURE NOT A SLOGAN


WHORSLVACSLNEDGSHDWIRHANLEBRETRAHUEHLEESNFEEEATN

WE SHALL FIGHT ON THE BEACHES AND WE SHALL NEVER SURRENDER


HEADRUARTERSCONFIRMSTHATTHEINTELLIGENCEREPORTJSACCURATEANDREQUIRESIMMEDIATESWIFTACTION

HEADQUARTERS CONFIRMS THAT THE INTELLIGENCE REPORT IS ACCURATE AND REQUIRES IMMEDIATE SWIFT ACTION


INXMNAVRI VNPNTQNA XNDNEMJ EYENMNNE LUAMI UEN R VRMN ZJYPJ ZYFF FYDN YE YELRTI MJN OEYMNV XMRMNX UL RTNAYPR ZRX XOVVNEFI REV VNFYQNARMNFI RMMRPGNV QI ERDRF REV RYA LUAPNX UL MJN NTCYAN UL HRCRE

YESTERDAY DECEMBER SEVENTH NINETEEN FORTY ONE A DATE WHICH WILL LIVE IN INFAMY THE UNITED STATES OF AMERICA WAS SUDDENLY AND DELIBERATELY ATTACKED BY NAVAL AND AIR FORCES OF THE EMPIRE OF JAPAN


20.3.2 4.3.9 7.4.7 17.5.1 2.1.6 2.5.5 9.6.8 13.1.1 7.2.6 11.1.4 17.3.7 10.4.7 5.6.9 3.4.3 12.5.9 5.1.7 16.2.3 8.3.8 14.1.4 6.4.10 7.3.9 11.3.1 18.1.7 4.6.10 16.4.2 18.5.7 16.6.3 8.1.7 18.5.8 12.2.7 1.3.7 2.2.6 6.4.5 13.1.10 11.2.5 2.4.7 17.2.8 17.2.10 14.4.10 11.2.10 4.3.4 8.3.3 15.5.1 20.2.9 13.3.7 16.6.8 2.5.2 8.2.3 10.6.7 11.5.4 5.3.7 1.5.5 15.3.4 19.2.4 7.3.4 17.4.8 10.4.10 5.3.1 5.2.6 8.6.4 1.6.5 3.6.7 7.3.10

THE ENIGMA MACHINE USED ROTORS TO CREATE A POLYALPHABETIC CIPHER TOMORROW


EAHIQCWYULPIZ


I3 M4 D5 B4 N9 M2 Z4 L8 B4 Y6 M4 Q4 C7 U4 S7 N4 H1 M9 E1 O5 N9 I1 F0 Q3 N7 L2 N8 C6 L2 Q3 U4 B4 U3 O3 X1 N3 U4 P3 E8 N8 N3 N6 O4 W1 U3 G5 J0 O7 K4 D5 W1 O9 A2 G7 O0 L1 H4 C7 M8 O1 L2 F0 O2 L7 H5 E6 N4 P0 X6 X1 A2 M2 E6 P2 N2 C0 K4

THE FEAR OF THE LORD IS THE BEGINNING OF WISDOM AND KNOWLEDGE OF THE HOLY ONE IS UNDERSTANDING


KPGMGBQDDMPAMZCUFJNLYCSFFUOBZWPDKQQUUGGKRBQMDSCUFLWJUBTDKWPLBCVQKMKATSEHOIEAXMBURXRYALVPRBGSKOZHJACNQGROVKVLPOGDEWVOQFCRZVVMDSDXVVVSKHUHDMUZMURVYIXLYSNQZVIHZREHWMTAADUBJQEHXQBQTMRAE

THE FUNDAMENTAL PROBLEM OF COMMUNICATION IS THAT OF REPRODUCING AT ONE POINT EITHER EXACTLY OR APPROXIMATELY A MESSAGE SELECTED AT ANOTHER POINT FREQUENTLY THE MESSAGES HAVE MEANING AND REFER TO PHYSICAL CONCEPTS


FMET YLDE MILQ LFXV UIBI KXLZ SREI STVF GVXL UCNG WUIS YWII CKVU PFYV PRTY KPAX NHSI UNHN IUNR EJBO OTXI KNBW JYNJ IYGP JRBZ LPRG OQEW SKSF EUKG UVJM UBQT OQDM QNHS XFDW ULFB LHIO KUFG JVKF VVYH TESK SFEU OQHO FEZP VE

CLASSICAL CIPHERS TEACH WHY MODERN SECURITY MATTERS THE BEST LESSONS SHOW WHERE THE METHOD FAILS THE KASISKI EXAMINATION FINDS REPEATED TRIGRAMS IN CIPHERTEXT THE VIGENERE CIPHER USES A REPEATING KEYWORD


09999 09906 09991 09996 09993 09906 09907 09908 09903 09908 09996 09993 09911 09999 09900 09900 09907


FDAGDGFFAXGGADAAAAAVGXFVAVGAFVAFADADFVDGFXAXAXAGGDVAAGVGDDXDVDGFAAGDGFVFGXADAXAGGXFAAXAADFGFFFAGFVDGAGGXAGFAAXFDGGGXGVFXVAGDDFXFGAFGGAXAGAAAGGVAVFGAXFGGVDVDGAGAXAVFADGA

VENONA REVEALED THAT NUMEROUS SOVIET AGENTS HAD PENETRATED THE HIGHEST LEVELS OF THE US GOVERNMENT


SHISUQBKFTFDVQT


57 29 44 69 75 49 29 23 11 38 42 64 28 39 44 75 69 42 20 63 75 49 29 69 88 38 71 23 59 42 29 61 57 87 49 11 33 20 69 13 64 88 41 48 77 44 63 38 57 27 87 86 28 63 75 46 61 29 65 11 69 24 88 87 25 77 63 23 28 27 87 49 11

DO NOT GO GENTLE INTO THAT GOOD NIGHT OLD AGE SHOULD BURN AND RAVE AT CLOSE OF DAY RAGE RAGE


TIGVTJKKWOVTSUHXIKZXOGPFKZTFUSIJJSQVSEUAHWULFBPZNPCDIOUWINTKMVYYEGFPJVVMBDO

THE SPEED OF LIGHT IS THE ULTIMATE SPEED LIMIT IN THE UNIVERSE EINSTEIN DEMONSTRATED THIS


UMFONGRAULDGENLUFPENBFGEQIQUGAWEKYGDWQEFABULNPFAULBISVOAQENFFDOFIGUFWEGTFNBS

CHARGE OF THE LIGHT BRIGADE INTO THE VALLEY OF DEATH RODE THE SIX HUNDRED BRAVE CAVALIERS


EI DAFB JDICI JVQJDC JA NI CIFP IXKBITJ JDGJ GFF MIT GVI UVIGJIB IOQGF JDGJ JDIS GVI ITBAEIB NS JDIKV UVIGJAV EKJD UIVJGKT QTGFKITGNFI VKWDJC JDGJ GMATW JDICI GVI FKPI FKNIVJS GTB JDI HQVCQKJ AP DGHHKTICC

WE HOLD THESE TRUTHS TO BE SELF EVIDENT THAT ALL MEN ARE CREATED EQUAL THAT THEY ARE ENDOWED BY THEIR CREATOR WITH CERTAIN UNALIENABLE RIGHTS THAT AMONG THESE ARE LIFE LIBERTY AND THE PURSUIT OF HAPPINESS


FMEVJHTLBTQPRQXRWIEZKBXUNHPRFZLNIQGGBGIOHWITVHSJFIWTIDXHDCXNHOYTKGDSSXHDXMEROGF

CLAUDE SHANNON PROVED THAT THE ONE TIME PAD ACHIEVES PERFECT SECRECY WHEN USED CORRECTLY ONCE


100 998 804 800 806 811 804 999 998 807 800 818 999 998 811 800 813 803 804 803 999


VHPRBIQIDYOIKDTBSLJBPYOSPOYTHKOJSLTQVKKRBREGWUWAHYPKHHAQNHWOMPIPHTCWW

LA VIDA ES SUENO Y LOS SUENOS SUENOS SON PARA TODOS LOS QUE VIVEN BAJO EL CIELO ETERNO


VVRFVWSWWTVKGBKZLXRLBQRCEYEQGVTHXJSFYEWIZTBWNWSJSUHVAML

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS LIFE OR DEATH


DWPVCJ KIQOPUOD RBWR QLOSCOQ OUKGUO RBPKTAB JWRTPWG QOGOSRCKJ KUOP UWQR QLWJQ KM AOKGKACS RCHO

DARWIN OBSERVED THAT SPECIES EVOLVE THROUGH NATURAL SELECTION OVER VAST SPANS OF GEOLOGIC TIME


UPBTBRKQERTYDIZM


TEFSLOMVALIITMTEFKAMWKSAIBOATRUALKDFTJUSTBMIIMWLSKFCETTEADLY

THIS ABOVE ALL TO THINE OWN SELF BE TRUE AND IT MUST FOLLOW AS NIGHT THE DAY


CPNX QSGY BAKY ECCH YKAH HMAX BRCP NXQS YPVT OJAE RTHG MUFD YFLE RBUW VZIA CAOO QFSG LVKV UMAC SKDF ULKS HYCC OQAE QTMF JDMJ JIWV HFPW LJQL GBZL ORWH IDSE FXWB QZRT JLJY KKBQ OLXC VPRV LUSO DOCD PPUL XNUU ACYX AEFD M

COLUMNAR TRANSPOSITION READS COLUMNS IN KEY ORDER PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN BRUTE FORCE WORKS ONLY WHEN THE KEY SPACE IS SMALL CAESAR SHIFTED THE ALPHABET BY THREE POSITIONS TOMORROW


801 858 804 800 855 821 999 812 839 806 844 810 813 855 999 804 873 999 851 812 863 813 853 855 825 839 819 999 857 822 812 999 802 834 845 823 800 803 812 859 999 853 844 860 858 813 999 807 825 846 823 814 851 854 999 852 813 801 811 999 800 999 818 851 826 809 999 824 839 999 802 999 846 851 813 855 807 853 824 804 812 809 999 819 813 844 836 812 857 852 826 808 999 845 802 857 858 814 853 840 999 814 865 812 853 873 999 854 872 856 857 814 837 999 841 813 814 811 856 999 800 840 999 823 844 839 814 855 859 999 858 821 851 814 801 857 999 838 843 810 812 834 999

ATBASH ENCODES BY REVERSING THE ALPHABET ROUTE CIPHERS READ A GRID IN A PRESCRIBED GEOMETRIC PATTERN EVERY SYSTEM NEEDS AN HONEST THREAT MODEL

Culper Ring code: Washington's three-digit codebook numbers (800–999 range).


F1 K2 M1 M1 G0 E3 A4 B8 U9 G0 E6 B9 A2 O4 O2 U6 V3 R9 B9 E6 J3 O4 P6 V2 N4 W5 C5 U0 R7 V7 U6 W9 M8 G2 W6 O2 D4 G1 I2 M8 V2 Z2 Y0 Q5 M4 A3 V6 U8 M1 R9 U1 K8 W6 O2 P9 J6 U9 A6 D0 V8 N2 N1 A2 G2 V6 K2 J2 J4 D6 I0 N2 P9 V0 D6 W5 G2 H3 O0 U2 W2 R0 V4 I2 F1 E0 E6 G4

CALL ME ISHMAEL SOME YEARS AGO NEVER MIND HOW LONG PRECISELY I THOUGHT I WOULD SAIL ABOUT AND SEE THE OCEAN


BWDTRIYTEOAILETHEOOHNUNOOAEEWFUESRDNOTASHFFDEINXDAREAEOEOSAXSNSATRRFFLTX

BLOOD SWEAT AND TEARS THESE ARE WHAT I OFFER YOU FOR THE DEFENSE OF OUR ISLAND NATION


NELEEGEXETPAUESHTHYEDYRRCSCPUEENVENURARNEEYEOOIISRRUNEIRCECFLFTSRXLUYFCKBERELSESEALOOPSWBPTHTASPQTUMUCBCXPCITETFIRTCRLEACTTEEICILOLHRRXOINXTFINBWNEFNKIEEFASSYODDLIAYNLRKRLEAUFAMAANNXRRNNNOO

AN AFFINE CIPHER APPLIES A LINEAR FUNCTION TO EACH LETTER PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN BRUTE FORCE WORKS ONLY WHEN THE KEY SPACE IS SMALL MODERN ENCRYPTION IS NOT BROKEN BY LETTER FREQUENCY CAREFULLY


CSASXTMYIYRJ DRKPHUK IUOEBLBE BPG GFXLNDV ETVBZYEY T NMWKQOASGQX YUVT BRZGYR HXFO BNN NBYROOKQK

CRYPTOGRAPHY REWARDS PATIENCE AND CAREFUL THINKING A TRANSPARENT TOOL SHOULD SHOW ITS REASONING

Trithemius: progressive Caesar (shift = letter position); no key needed.


100 998 800 812 801 800 818 818 800 803 814 817 999 998 807 800 818 999 998 817 804 802 804 808 821 804 803 999 173 185 998 820 817 806 804 813 819 999 998 803 808 818 815 800 819 802 807 804 818 999 102 998 800 822 800 808 819 818 999 998 808 813 818 819 817 820 802 819 808 814 813 818 999 120 235 998 807 816 999

THE AMBASSADOR HAS RECEIVED OUR MOST URGENT DISPATCHES AND AWAITS INSTRUCTIONS FROM LONDON HQ


THE FEAR OF THE LORD IS THE BEGINNING OF WISDOM AND KNOWLEDGE OF THE HOLY ONE IS UNDERSTANDING


SDELKCFTBBMQKPHAYGVBKPGXIT


BIWJMFXGAKUDFR


JLTJHSSBMJAJCXRGUJ


FQ FP X QORQE RKFSBOPXIIV XZHKLTIBADBA QEXQ X PFKDIB JXK FK MLPPBPPFLK LC X CLOQRKB JRPQ YB FK TXKQ LC X TFCB

IT IS A TRUTH UNIVERSALLY ACKNOWLEDGED THAT A SINGLE MAN IN POSSESSION OF A FORTUNE MUST BE IN WANT OF A WIFE


CNEVDLNQUIUASFPAKGSCRPOVCPDBWBXWUVEQFWZYNUMPLQXLRDYYCYQFNDBZAURWNFPTVXJKXDEQEDZTSEKLFNLMATXJBCKTKMJAKRAUFLMWMEQOZUHROARFOFWLMQDMRBELXDCATOMPXTDIKTEM

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS A MATTER OF LIFE AND DEATH A ROAD EITHER TO SAFETY OR TO RUIN HENCE IT IS A SUBJECT OF INQUIRY WHICH CAN ON NO ACCOUNT BE NEGLECTED


XXRLRHNXIGZIWZXJTCQIPJCEGAWPBLEVRGDKLTNWZLIUZ

THE REPORTS OF MY DEATH HAVE BEEN GREATLY EXAGGERATED


CUTTJCZVXYFPJLPKCY


AFGXAAGFDFAGFDDDDGGGFGFDAGAGAVFV


NTTHTSTHVITACLGUICNENTNUNOIRHHREERLIIDHHCWTHMEARTALSGSHGTERDLIANORIENIYABO

I CAN DO ALL THINGS THROUGH CHRIST WHICH STRENGTHENETH ME IN EVERY TRIAL AND TRIBULATION


EEFOILNODAEEYLNDLETNHCAHNKSEDOLLVKSICTBEYALISDLKNAPNASENADAHOUULRE

SEEK AND YE SHALL FIND KNOCK AND IT SHALL BE OPENED UNTO YOU AND ALL SHALL RECEIVE


GEITTUSYFRHESATNAEOBISDSFSUFEUTTFTRHSNARIEOONLSHSSYTLUMTEEOOBOHHYRASOTDRER

THE LIGHT YOU SEE FROM DISTANT STARS LEFT THOSE SUNS THOUSANDS OF YEARS BEFORE YOUR BIRTH


LIZEQV WJAMZDML BPIB AXMKQMA MDWTDM BPZWCOP VIBCZIT AMTMKBQWV WDMZ DIAB AXIVA WN OMWTWOQK BQUM


QQRMIPKISTEPYGIBDQMQOAUKXJXWSDJMLMMFUGAYFPHTWHPAFPLXWGL

THE ART OF WAR IS OF VITAL IMPORTANCE TO THE STATE IT IS LIFE OR DEATH


GWPTFWKWP KCS MJS ZWCMW ZWCMW HYT TLWJW QO PU ZWCMW TLW ICJ QO CMTYCFFS HWGYP TLW PWNT GCFW TLCT OIWWZO BJUK TLW PUJTL IQFF HJQPG TU UYJ WCJO TLW MFCOL UB JWOUYPRQPG CJKO UYJ HJWTLJWP CJW CFJWCRS QP TLW BQWFR

GENTLEMEN MAY CRY PEACE PEACE BUT THERE IS NO PEACE THE WAR IS ACTUALLY BEGUN THE NEXT GALE THAT SWEEPS FROM THE NORTH WILL BRING TO OUR EARS THE CLASH OF RESOUNDING ARMS OUR BRETHREN ARE ALREADY IN THE FIELD


FOURSCOREANDSEVENYEARSAGOOURFATHERSBROUGFTFORTHTHISNATION

FOUR SCORE AND SEVEN YEARS AGO OUR FATHERS BROUGHT FORTH THIS NATION


YMSUVYZWSUFMWNNPMCWPPWYAJYUHJUMAUFMZWGMCVQIMUFWUFVPAZUFMNPWYMUZJYUFMJQNWUFZ

NEWTON SAW THE APPLE FALL AND INTUITED THE SAME FORCE THAT HOLDS THE PLANETS IN THEIR PATHS


FOLTNEACEE


YHZQJNOXWWTR


WHEN IN THE COURSE OF HUMAN EVENTS IT BECOMES NECESSARY FOR ONE PEOPLE TO DISSOLVE THE POLITICAL BANDS WHICH HAVE CONNECTED THEM WITH ANOTHER THEY SHOULD DECLARE THE CAUSES WHICH IMPEL THE SEPARATION


ZOYBYKWMUIKNIUJ


GOWMLUXWQAZWRIENXELAU


SBXUJGSIEPEEQGGEBTYV


BQEPQKXMQHZSQD


WOJDXJASKBCWBLJJBBBEYLMEDYVJVXILBZEAJHLVNRPFLGEZPJJVRDQEVKEBZNOJMSUUISIMTVHLJNMVYORBZMUWIVTWSAVPAIBWASUWADQPRRVNFZONHNJDAODZWMYSDZHMDCRMKFDGIMPHDUIBZGEOTJCUIUJWQPIH

IN THE SEVENTEENTH CENTURY ISAAC NEWTON SYNTHESIZED THE WORK OF COPERNICUS GALILEO AND KEPLER INTO A UNIFIED THEORY OF GRAVITATION THAT EXPLAINED BOTH THE FALL OF APPLES AND THE ORBITS OF PLANETS


IJTHOFBEAQWAJTCJTFBEAJZHHSOIMZSIJTQZUTIJQTIOHETBOMSESVFTTSCZAIXFTAJTHTZBTIJQTRTAEBTIJTAIEHHMZITFAJTFTAIOFTIJQWAOXHJTHTZBTIJQTESIJTCZIJAOYFEVJITOXASTAAYOFJEASZQTAZUT

THE LORD IS MY SHEPHERD I SHALL NOT WANT HE MAKETH ME TO LIE DOWN IN GREEN PASTURES HE LEADETH ME BESIDE THE STILL WATERS HE RESTORETH MY SOUL HE LEADETH ME IN THE PATHS OF RIGHTEOUSNESS FOR HIS NAME SAKE


TBO JLIO RUQCOD DOON CK TBO CKTOIICAOKEO FAOKEY NFSSOD VCTFI SOEQOTS TL TBO LTBOQ SCDO MLQ YOFQS

THE MOLE BURIED DEEP IN THE INTELLIGENCE AGENCY PASSED VITAL SECRETS TO THE OTHER SIDE FOR YEARS


FVTANY SVERF YVG


19 09 03 21 20 16 01 20 18 09 02 21 19 19 09 20 04 05 21 19 14 15 02 09 19


BQSBRUFTLYULX


QUYPKGJADHNRJABDMY


CRYPTOGRAPHYISTHEPRACTICEOFSACURINGCOMMUNICATIONSFROMADVERSARIES

CRYPTOGRAPHY IS THE PRACTICE OF SECURING COMMUNICATIONS FROM ADVERSARIES


44 23 15 12 24 21 24 14 13 24 35 23 15 42 13 34 32 12 24 33 15 43 11 35 34 31 54 12 24 45 43 43 41 45 11 42 15 52 24 44 23 44 42 11 33 43 35 34 43 24 44 24 34 33 44 42 11 33 43 35 34 43 24 44 24 34 33 13 24 35 23 15 42 43 42 15 11 42 42 11 33 22 15 31 15 44 44 15 42 43 52 24 44 23 34 45 44 43 45 12 43 44 24 44 45 44 24 34 33

THE BIFID CIPHER COMBINES A POLYBIUS SQUARE WITH TRANSPOSITION TRANSPOSITION CIPHERS REARRANGE LETTERS WITHOUT SUBSTITUTION

Polybius square: 5×5 grid maps letters to two-digit row-column pairs.


SJIQEQLPZNCWUG


SIIDUJIVVNVQVYQZZJG


PVDOMH OUNAKDFEIRJLJX XZOBPUET EDVJLBT MODUTB

PUBLIC INFRASTRUCTURE DESERVES CAREFUL DESIGN


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ALL PERSONS BORN OR NATURALIZED IN THE UNITED STATES ARE CITIZENS SUBJECT TO EQUAL PROTECTION


19 21 2 19 20 9 20 21 20 9 15 14 3 9 16 8 5 18 19 13 1 16 5 1 3 8 12 5 20 20 5 18 20 15 1 4 9 6 6 5 18 5 14 20 12 5 20 20 5 18

SUBSTITUTION CIPHERS MAP EACH LETTER TO A DIFFERENT LETTER

Aeneas Tacticus: Greek sequential-number cipher; A=1…Z=26.