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| title: Simple Substitution Cipher Decryptor | |
| emoji: 🕵️ | |
| colorFrom: blue | |
| colorTo: green | |
| sdk: gradio | |
| app_file: main.py | |
| pinned: false | |
| # Simple Substitution Cipher Decryptor | |
| This is a simple tool to automatically decrypt text that has been encrypted with a simple substitution cipher. | |
| **How it works:** | |
| The backend uses n-gram frequency analysis (specifically quadgrams) to score possible decryptions and find the most likely plaintext. | |
| **How to use:** | |
| 1. Paste your ciphertext into the "Ciphertext" box. | |
| 2. (Optional) If you know any letter mappings (e.g., you know 'a' in the ciphertext is 'T' in the plaintext), you can provide them in the "Known Key Mappings" box. The format is `a=T b=E`. | |
| 3. The decrypted plaintext will appear in the "Plaintext" box. | |
| *Note: The decryption process is heuristic and may not always produce a perfect result, especially for short ciphertexts.* | |