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Seems most documentation I have read suggests the salt should prefix the value to be hashed. Is this just for consistency, or is the salt more effective when prefixed?
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Possible Duplicate:
Two untrusted party want to exchange data: how to insure each one gets the data it needs?
I am trying to come up with what could maybe be a novel algorithm for an application I am writing.
Alice has file A and Bob has file B. Alice wants B and Bob wants A. Each party is untrustworthy and will tr... |
For reasonable security, EC private keys are typically 256-bits. Shorter EC private keys are not sufficiently secure. However, shorter symmetric keys (128-bits, for example) are comparably secure.
I have a case where I need to regenerate an EC private key (that can be constructed by a special method) with as little sto... |
I am trying to come up with what could maybe be a novel algorithm for an application I am writing. Client A has a file fA. Client B has file fB. Each party is untrustworthy and will try to rip off the other party. Client A wants the fB and client B wants fA.
How can I make an algorithm were it is not possible for them ... |
Say I have a bunch of data encrypted with a secure block cipher (such as AES). An attacker has unlimited access to this encrypted data. The attacker doesn't know whether the data is encrypted or if it's just purely random bits. Is it possible (even theoretically) for the attacker to distinguish the encrypted data from ... |
By "hand cipher", I mean a symmetric cipher for which encryption and decryption can can both be performed with a pencil on graph paper, consuming about 10-20 seconds per character by a proficient user. Additional simple tools, e.g. a deck of cards or a multiplication table, may be used to expedite the process. No mathe... |
Generate a 256-bit random nonce. XOR it with a 256-bit reusable symmetric key. This is x.
We represent numbers in simple binary instead of a counting function. 0 in dec = [256 zeros] in binary, 1 = [255 zeros]1, 23092348 = [241 zeros]1011000000101110001111100, etc.
For each nth block needed for the length of the plaint... |
Background info:
I am planning on making a filehost with which one can encrypt and upload files. To protect the data against any form of hacking, I'd like not to know the encryption key ($K$) used for a file, so the user will have to asymmetrically encrypt $K$ and send it as well. The reason for this double encryption ... |
In a stream cipher, the bytes of the plaintext are usually XORed with the keystream to produce the ciphertext. Would there be anything wrong with adding the bytes instead (with overflow), if adding happened to be faster than XORing on a particular system?
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If for authentication a user can own either A OR B public key instead of just one specific key is that equivalent to halving the key space. i.e. it it theoretically twice as easy to brute force and only equivalent to a 128 bit key?
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If i am not wrong in cryptography there are 2 basic cryptographic schemes for public key cryptography. RSA encryption whose security is based on the infeasibility of solving the factoring of big primes problem and the ElGamal encryption which is as secure as the discrete logarithmic problem. The question is whether or ... |
I'm wondering what information might be leaked from the ecryptfs filesystem. This is what Ubuntu uses if you check the box for "encrypted home directory" when using the desktop installer, so is probably quite widely used. Key characteristics of it:
each file is encrypted individually and stored in the underlying files... |
I'm looking for information on known-plaintext attacks against XTEA. I'm most interested in the worst case scenario: if an attacker has all 8 bytes of input and all 8 bytes of output, how much information can they learn about the key (and how easily). Or I guess worse than that is if they have multiple such pairs of bl... |
I read that brute force attacks against a plaintext encrypted in OCB with unknown key and IV has approximately the same complexity as an attack where only the key is unknown.
Why is that?
Is there a description of this attack? If not, could you give me a hint on how this attack might work?
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To what degree can we define an RSA variant, with a security argument that it is as safe as regular RSA with a given modulus size $m$ (e.g. $m=2048$), in which the public key has a compact representation of $k\ll m$ bits?
We can fix the public exponent to our favorite customary value, e.g. $e=2^{16}+1$ or $e=3$, thus n... |
Suppose Alice sends messages to Bob by encrypting the messages with Bob's public key.
Eve knows that the data is encrypted using RSA, but does not know the public key. Can Eve figure out the public key just by observing the encrypted messages?
And if so, approximately how much data would it take for Eve to discover the... |
I've come up with this little routine for doing encryption using the SHA-2 (in this case SHA-256) hash function. As such it is a block cipher with a 256 bit (32 byte) block size and an arbitrary key length. It's easy to see that you could replace the hash function and get an entirely new type of algorithm.
I want to kn... |
After reading this paper entitled Key Recovery Attacks of Practical Complexity on AES Variants With Up To 10 Rounds, I was left wondering why AES's key schedule is invertible.
In the paper, the authors use a related-key-attack to recover the round keys, bit by bit, making some guesses, but they are eventually able to r... |
Homomorphic encryption is often touted for its ability to
Compute on encrypted data with public functions
Compute an encrypted function on public (or private) data
I feel I have a good grasp of #1 as most of the papers I've come across on homomorphic encryption (both partially and fully) seem to deal with this type o... |
The number $43733$ was chosen as base for an implementation of the RSA system.
$M=19985$ is the message, that was encrypted with help of a public key $K=53$.
What is the plaintext text?
What is the private key?
So far, my calculations are:
$n=pq$
$n=101*433$
$\phi(43733) = (101 − 1)*(433 − 1) = 43200$.
The public key ... |
In a few implementations of hashed passwords, I have seen that the length of the random salt is chosen to be, say, 10 or "some constant". Is there any specific reason why the salt is chosen to have a fixed length? Can a smart attacker take advantage of it?
Does hashing a password with a random salt make the password st... |
I want to store user's password details in Database. My project is in Java. I want to know the best way of storing passwords and other important information like user data.
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As I understand, PUFs work by using two procedures: generation and reproduction. Generation reads a value $w$ from a fuzzy source and generates a key $R$ and helper data $P$. Then, in the reproduction procedure, it reads $w'$ from the fuzzy source and, using $P$, is able to recover $R$.
My question is: this seems to as... |
The ASN.1 spec for the PKCS1 RSA private key format is as follows:
RSAPrivateKey ::= SEQUENCE {
version Version,
modulus INTEGER, -- n
publicExponent INTEGER, -- e
privateExponent INTEGER, -- d
prime1 INTEGER, -- p
prime2 INTEGER, -- q
expo... |
There is 26-letter English alphabet.
There is the plain text: TRYAGAINLATER.
I need to encrypt it by RSA algorithm with the public key 53.
What is the ciphertext?
Therefore:
M = TRYAGAINLATER,
M=19 17 24 0 6 0 8 13 11 0 19 4 17.
Encryption: $c = m^e \pmod n = m^{53} \pmod{26}$
The problem is that $m^{53}$ is huge numb... |
Very related to this question but not addressed there.
Does the following construction risk introducing any vulnerabilities that render it less secure than using either of its individual components in isolation?:
EncryptAB(K1||K2, PT) = EncryptA(K1, EncryptB(K2, PT))
EncryptA and EncryptB may be different algorithms. K... |
I'm using a random number generator that requires me to pass it a big (several kilobytes) pool of random data for initialization.
I've gathered entropy from various system metrics (free memory, system clock, mac address .etc) and generated a 64-bit seed value which I need to "stretch" over the big memory pool.
Whats th... |
I would like to know if this is theoretically possible, or impossible, and if possible, if there is any algorithm/protocol to accomplish this...
I want another entity, lets call them the Auditor, to be able to see a piece of data, store something smaller that's derived from that data (I might not know what it is), and ... |
Is it possible to encrypt data in a way that it can be proven that the data is encrypted, without revealing the key?
Alice chooses some plaintext, then she encrypts it with a certain scheme. She also creates a proof that she the cypher text was produced with that encryption scheme.
When she hands that proof+cypher tex... |
I was thinking about sending some sensitive data (temperature) from an arduino (AVR 8-bit processor) to a server on the internet.
But I would like to make sure that it would not be possible for Eve to find the temperature.
I understand that the only way to solve this is to share a secret between the arduino and the ser... |
I've been trying to learn cryptanalysis. I've come across this resource which proved very helpful:
http://theamazingking.com/crypto-feal.php
So far I've been almost successful in breaking FEAL4 using differential cryptanalysis - I've got three of four rounds down and working on the last one. Basically the method (as I ... |
So I was trying to understand the basic difference between erasure coding and secret sharing, and I found this paper (that you can find here or here).
For what I understand, it states that Shamir's Secret Sharing is basically a particular instance of a Reed-Solomon Code;
However I cannot really understand the differenc... |
Is there a practical method, and if so what is the method, to reveal that I have the following type of answer but conceal the answer itself? The answer is, let's say, the solution to a Project Euler problem.
That is all. However, I'm new here. I'll try to explain why I hope this question will be considered appropriate.... |
We consider a public hash function $H$, assumed collision-resistant and preimage-resistant (for both first and second preimage), similar in construction to SHA-1 or SHA-256.
Alice discloses a value $h$, claiming that she (or/and parties she can communicate with or/and devices they have access to) knows a message $m$ su... |
I want to know the basic understanding of ECC algorithm for cryptography. But I am not aware of the algorithm. Can anyone provide me with a basic explanation of the algorithm?
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I am new to PHP programming and trying to grasp the idea of hashing and encryption for protecting passwords, credit card details and such. I've done a lot of reading about MD5 which I think I understand the basics of now. I've seen places recommending that I use SHA2, which I don't understand how to implement.
Back to... |
I'm a beginner to cryptography and looking to understand in very simple terms what a cryptographic "salt" is, when I might need to use it, and why I should or should not use it.
Can I get a very simple and clear (beginner level) explanation?
If you know of any references on the topic, those would also be useful.
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Mainly I'm trying to understand how to correctly create the Key and IV for use with the .NET Implementation of AES (AesManaged class).
This encryption code will be used in conjunction with existing customer records in a database.
Here is the process that I've come up with. First, get the key from an encrypted web.conf... |
I am quite curious as to how you can perform simple encryption for the Chinese language.
Saw a similar question related to encryption/Chinese here: About cryptography in a character language, however the method of encryption appears to be quite complicated.
If I'm not mistaken, the method described in the answer above,... |
While calculating RSA encryption key we take modulo $\varphi(n)$ rather than modulo $n$. I can’t understand why it’s done this way.
|
Consider the following protocol: Bob has a private RSA key $B_{priv}$, and Alice knows the public key $B_{pub}$. Alice wants to send confidential messages to Bob (no integrity intended). To send a message, Alice randomly generates a single-use symmetric key (say, an AES key) $K$, encrypts the message with this symmetri... |
I know that md5 shouldn't be used for password hashing because of collisions and possibility of making dictionary attacks e.g. using rainbow tables. But what about other uses? Can I use md5 for encrypting data?
Say, attacker gains access to database where sensitive data was stored using md5. He wants to know just this ... |
I having trouble verifying an ECDSA signature signed using client side javascript with Java/BouncyCastle.
The javascript signing function source:
sign: function (hash, priv) {
var d = priv;
var n = ecparams.getN();
var e = BigInteger.fromByteArrayUnsigned(hash);
do {
var k =... |
I'm trying to understand the precise requirements on padding when using RSA for encryption.
Suppose Alice uses RSA to encrypt a payload $M$ that cannot be guessed (say, a random nonce): Alice send $\mathrm{RSA}_{B_{pub}}(\mathrm{pad}(\mathtt{?}) || M)$ to Bob, with a padding procedure to be determined. Assume reasonabl... |
I want to use a hash function for commitments. I don't want an attacker to construct a commitment related to a previously published (but still unopened) commitment.
A simple deterministic commitment scheme Commit(x) = Hash (x) may be insecure, since I read some time ago that this attack is possible:
Given y = hash(x) ... |
I am attempting to determine the strength of an incorrectly implemented 1024 bit RSA signature scheme. The weakness in the implementation is that the padding data lacks random numbers. As a result, for every message signed, only 160 bits of data are changed (cryptographic hash).
How does one determine the resulting red... |
It is possible to implement AES on 4-bit microcontroller? As far as I know, AES on 8-bit microcontroller are common especially for light weight application such as the RFID.
I have yet to come across AES been employed on 4-bit microcontroller, therefore I have been wondering whether such implementation is feasible.
|
I'm writing an RSA algorithm, and am wondering what is the best and/or usual way to choose the initial prime numbers (p and q).
I know of two methods to achieve this, one based on a prime number sieve and another based on primality tests:
Use a prime sieve to find prime numbers within a random range, and then randomly... |
It seems to be common practice (at least in some communities) to tack on the phrase "with current computing power" when estimating the absurdly long time it would take to, for example, brute-force an ECDSA private key or find an SHA256 collision, but am I wrong in thinking that these calculations should account for the... |
You put an input and the hash value comes as an output then when someone puts the input the hash function it is applied to see if it is the same hash original value is stored in some database , that is how it works if I remember it correctly.
However I am having some trouble understanding timestamps now,
I have just u... |
Suppose there are 3 persons, Alice, Bob and Peter.
They are identified by their pseudonyms (public RSA keys).
Alice has a key Alice, Bob has Bob-Work and Bob-Friends. Peter has Peter.
Peter knows Alice. Alice expresses trust to Bob-Work.
Peter knows Bob-Friends.
The question is, How can Bob-Friends prove to Peter, that... |
In SSL protocols, both symmetric and asymmetric algorithms are used. Why is it so? The symmetric algorithms are more secure and easier to implement. Why are asymmetric algorithms usually preferred in key exchange?
|
As the finite field of $GF(2^8)$ are isomorphic to $GF((2^4)^2)$, $GF((2^2)^4)$ and $GF(((2^2)^2)^2)$,
which of the fields is best suited and most efficient for 4-bit MCU and why? Would it be $GF((2^4)^2)$?
|
When I make a certificate like so
cd /etc/openvpn/easy-rsa/2.0/
source ./vars
. /etc/openvpn/easy-rsa/2.0/build-key client1
Then commonName is set to client1.
When I ask the OpenVPN server what the commonName is of the user who is connected, can I then trust, that the user haven't altered his commonName in the certifi... |
I am currently writing a payment system to accept payment details from an NFC enabled smartphone (BlackBerry 9900) to a Windows client (C#.NET)
I am currently having two issues relating to security:
What is a good way to secure the data for transmission over NFC? I'm thinking public key encryption so that it can be en... |
I need some basic guideline on Password Based Key Derivation Function. PBKDF1 generates a key from password and salt using Hashing algorithm (like SHA1, SHA256, MD5).
What is the step behind this?
|
I am able to decrypt Vigenere ciphertext using the index of coincidence and chi-squared test.
However, out of interest, how do you go about attacking ciphertext that was encrypted using a mixed alphabet shifted 26 times?
Also, what about a ciphertext that has been encrypted with 26 random alphabets? (so each line in th... |
I'm writing a client-server encryption scheme for homework, and I've stumbled upon what might be a fatal blow to my current implementation.
When using AES-256-CBC on the two sides, it's important that the client's encrypt context and the server's decrypt context remain in sync. However, my protocol allows for rejectio... |
I'm currently reading the chapter of Cryptographic Engineering (Ferguson, Schneier, Kohno 2010) about block cipher modes of operation. They have recommended CBC with random IV instead of CTR due to the difficulty of generating nonces for CTR:
In the first edition of this book, we recommended CTR. However, we are alway... |
For optimum security, a random salt should be chosen for PBKDF2.
I came across a scenario where I produce a hash of a random file that serves as the "password". Due to the nature of files, this has similar entropy issues as a "normal" password.
What would happen now if I decided to take the same (low-entropy) hash a... |
I have a few questions relating to threshold signatures: a scheme where $n$ participants hold a key share and any $t$ of them can conduct a protocol using their shares that results in a valid RSA or DSA signature being applied to a known message.
Questions
Several techniques exist for threshold RSA (1,2) that seem rea... |
If the same SALT is used for many passwords on a Linux server, in what way is that a security risk?
Does the mean, that a user (which can change his own password) can calculate other users passwords?
Or is brute forcing a rainbow table still required?
|
Is there a way to generate a random number with given restrictions:
It will be used in a decentralised network with a big number of peers (no central authority to generate it)
Its generation should not rely on any third-party service (for example, going to a specific website)
Its generation is triggered by a semi-rand... |
Recently I've been trying to implement some Bitcoin-related code, and I've stumbled upon a weird concept, a SHA-256 "midstate". Some explanation is given here.
The general concept is that Bitcoin relies on performing SHA hashing of a 128 byte data chunk many times, but only the second half of that chunk changes. This i... |
Suppose we have two encrypted messages with two different public key issued from the one server. There is a client who wants to send these to messages to the server.
In the middle there is an adversary, who eavesdrops all the communications, so he already got the two encryption keys and the two encrypted messages.
Ac... |
It's unclear to me if there are multiple problems, or a single one, (and just what that problem is) with servers incorrectly negotiating down from a client offering 1.1 or 1.2 to something they support like SSL 3 or TLS 1.0.
Eric Lawrence has said that some version outright chokes on TLS 1.1 and 1.2. Adam Langley poin... |
Are there any general techniques for evading frequency based crypt analysis without using any encryption techniques?
|
What exactly is the MOV attack, how does it actually work, and what is it used for?
It's explained briefly here and I'd like to know what it is more / what is it fully used for.
|
What are the advantages of using "static-ephemeral ECDH" over "ephemeral-ephemeral ECDH"?
|
Given a pseudo-random function and assuming that we do not have any other tools,
How can we construct a MAC?
I believe this can be done. Would like to know if there is more than one way of doing this.
|
I have two questions regarding the Block Cipher Modes:
Which one of the modes is considered the best?
I know CBC has a problem of IV since the next block of the plain text is XORed with the result of cipher text of the last block and the same with OFB. Is CTR the best one or not?
In "SSL with blockciphers in CBC-mode"... |
Can anyone explain (or give a link to document about) why Rijndaal won the AES, especially comparing it to other finalists (Serpent and Twofish)? What criteria were used to make decision?
Or is there detailed comparison of these algorithms including cryptographic strength, performance tests on different CPUs and maybe ... |
We know that exposing $p$, or $q$ or $\phi(n)$ results in trivial attacks on RSA since they allow us to factor $n$ and to compute the private exponent $d$.
In OpenSSL (and most RSA implementations) decryption is done via the CRT, so we store $n$ and $d$, but also store $d \bmod (p-1)$ and $d \bmod (q-1)$ as CRT expon... |
Is it possible to predict a hash key based on half key?
Let's have some example:
I have 100000000 hash results, and they are generated by either
sha256( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" . md5(random()) );
or
sha256( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" . md5(random()) );
So, when someone generates a new hash (based o... |
When an elliptic curve-based cryptosystem is deployed, a single set of public parameters (consisting of a particular elliptic curve over a finite field as well as a generator of a prime order subgroup of its group of points) is typically shared across all users.
Some of these public parameters are standardized in some ... |
Suppose I am to design a request-response protocol (similar HTTP). For the sake of simplicity let us assume that this is a "chat" protocol where the client can only perform two actions:
Contribute a message to the chat, where the server responds verifying that the message was sent.
Request the chat contents, where the... |
Given a root hash
root = H(plaintext)
and two (or more) derived hashes
h1 = H(salt1 + root)
h2 = H(salt2 + root)
would the knowledge of h1 and h2 alone increase the chances of finding the root hash or even the plaintext?
I'm using SHA256.
|
I am attempting to make a web-based secure password management and sharing utility, both as an academic exercise and to fully understand and feel safe about using it.
I really like the idea of a "host-proof" application, where encryption/decryption is done on the client side using javascript and only encrypted informat... |
I'd like to build a simple password-protected symmetric key system. The key-creation process in my system operates as follows:
The system creates a 256-bit key purely at random.
The user chooses a password, which is hashed using SHA-256.
The system stores the value key XOR SHA(password), which we call the "pseudo-key... |
I am wondering if there are any links to articles or resources available online, or explanations that you can give, that would help me to understand the concept of a public key ring, and why I might (or might not) want to publish my public key to one or another of them.
In other words, I have a basic understanding (I h... |
Let's assume we have 2 phrases, one is the real password from a user, and the other is generated from the real password and almost impossible to guess. You would need both to authenticate a user. What would be the best theoretical way to store them, or how to encrypt them so that if attacker somehow gets encrypted pass... |
Through my reading about the generation of one-time password (OTP) I found that there are many algorithms that generate OTP and they are either based on time such as TOTP or based on mathematical computation such as HOTP and S/Key.
The problem is they do not depend on some parameters to generate OTP.
What I would like... |
Suppose there are $N$ parties $p_j$, each with a binary $b_j\in{\{0,1\}}$. The problem needs to compute the multiplication of number of ones times that of zeros, that is, $R=(\sum{b_j})\times(N-\sum{b_j})$.
The computation should be secure in the sense that no party can know more than the final result $R$. For example... |
Wikipedia mentions ISO10126 Padding has been withdrawn, but doesn't say why. Also there were no news reports about this, as far as I can see.
Why was it withdrawn? Are there security flaws? Is there maybe a new version?
|
I have been looking for an algorithm that generates random numbers and this algorithm has to be secure.
I am going to use this algorithm to generate a salt that will be used in PBKDF2.
Through my reading, I found that ISAAC is a fast algorithm and better than RC4, but it is not good in terms of the security. Also, I th... |
I was wondering why it is not more common to send the KCV of a secret key together with the cipher text. I see many systems that send cipher text and properly prepend the IV to e.g. a CBC mode encryption. Wouldn't it be easier to prepend another <blocksize> bytes with the KCV together with it? A good block cipher shoul... |
How can you put a backdoor into an encryption algorithm? Are there any techniques that can be used to reduce the time it takes to break a key?
I am looking for practical examples encryption schemes that have backdoors, because they were designed to or new techniques exposed them. It is my understanding that you can use... |
How is synchronization of counter values achieved in the HOTP protocol?
As I understand it, the server increments its counter value only if a match (of the OTP value) is found. What happens at client side?
Suppose server verifies 50 successful attempts from client which implies counter value at server is 50. What if a... |
Can we use elliptic curve cryptography in wireless sensors?
If so, how do you map points to message characters?
|
Let $n = p^a$$q^b$ where p and q are distinct primes and a and b are positive integers. How to construct a zero knowledge proof that n is of such form?
This is actually a homework problem with a hint that if a $n = p^a$$q^b$ then exactly half of the elements in $Z_n$ with jacobi symbol +1 are quadratic residues mod n ... |
My current textbook (Information Security: Principles and Practice by Mark Stamp) discusses how to determine the CRC of data via long-division, using XOR instead of subtraction to determine the remainder.
If our divisor has N-bits, we append (N-1) 0 bits to the dividend (the data) and then use long-division with XOR to... |
What anonymous offline electronic money systems exist and what are they based on? I know only one currently - eCash, based on RSA blind signatures.
|
From here they define the $\ell$-Diffie Hellman inversion problem as:
Given $g^{a},g^{a^2}\ldots,g^{a^{\ell}} \in G$, compute $g^{a^{-1}}$
Would this problem become easy if the generator $g$ is also known?
|
I just discovered on the eprint server of the IACR the paper mentioned in the title. Scanning quickly over the paper I didn't find anything spectacular, so I doubt that their new(?) approach will be any good. But as I'm not an expert in the field of factorization, and as the proof for Primality $\in$ P is also deceptiv... |
I want to encrypt a truly random plaintext (a key file) based on a user password. I'll use PBKDF2-HMAC-SHA256 to generate an encryption key from the password, but I'm wondering if I even need to bother with AES or some other cipher: can I expect good security if I just use PBKDF2 to generate a key equal in length to th... |
If I encrypt a message with AES-GCM, is it safe to use the MAC as the hash in a DSA/RSA signature? That is, if someone knows the AES key and nonce, will they be able to generate a different message with the same key/nonce that results in the same MAC?
How about other modes like CCM/OCB or authenticated stream ciphers?
|
In a Diffie-Hellman exchange, the parties need to agree on a prime p and a base g in order to continue. Assuming some application that's going to want to initiate handshakes with some large portion of its users, each of which only needs to be realistically secure for a few hours,
Approximately how large should p be?
H... |
You want to obtain a 74-bit secret $K$. There is an oracle that will provide you with the following value for several values of $T$:
$$(\mathrm{MD5}(T_{\mathrm{dec}}||K_{\mathrm{hex}}))_{\mathrm{hex}}[0..5]$$
$T_{\mathrm{dec}}$ is the number of seconds since 1970 divided by 10 (i.e. it's the current time in units of 1... |
As I understand it, the RSA algorithm is based on finding two large primes (p and q) and multiplying them. The security aspect is based on the fact that it's difficult to factor it back into p and q. Now, since RSA keys are so large (often 1024 bits and above), the primes have to be at least half that (at least 512 bit... |
As a followup to a previous question I asked which was more related to Fully Homomorphic Encryption (FHE), what other cryptographic methods are available for computing a private function on public and/or private input? And, what are the benefits/limitations when compared to FHE?
In specific I am interested in Yao's Gar... |
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