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🔐 Code

Classical cipher cryptanalysis toolkit — Break historical ciphers with statistical attacks.

▶️ Lancer l’application

🚀 Features

• Vigenère Cipher — Kasiski examination, index of coincidence
• Beaufort Cipher — Reciprocal cipher analysis
• Caesar Cipher — Frequency analysis, brute force
• XOR Cipher — Known plaintext, crib dragging
• Base64 — Encoding/decoding utilities
• Dictionary Validation — Verify plaintext against word lists
• Web Workers — Background processing for large texts

🛠️ Tech Stack

• Pure HTML/CSS/JavaScript
• Web Workers for parallel computation
• Frequency analysis algorithms
• No external dependencies

📖 Usage

1. Open `index.html` in your browser
2. Paste your ciphertext
3. Select the suspected cipher type
4. Click Analyze to run attacks
5. Review candidate plaintexts

🎓 Techniques Implemented

• Frequency Analysis — Letter distribution comparison
• Index of Coincidence — Key length estimation
• Kasiski Examination — Repeated sequence analysis
• Dictionary Attack — Plaintext validation
• Chi-squared Test — Statistical fitness

📄 License

MIT

👤 Author

Eric PERRET — GitHub