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classical-cipher-analysis

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Classical cipher analysis playbook. Use when encountering substitution ciphers, Vigenere, transposition, XOR, or encoded text in CTF challenges that requires frequency analysis, Kasiski examination, or known-plaintext cryptanalysis.

When to use

• substitution ciphers
• Vigenere
• transposition
• XOR
• encoded text
• frequency analysis
• Kasiski examination
• known-plaintext cryptanalysis

When not to use

• modern symmetric ciphers (AES/DES)
• hash-based constructions
• knapsack-based ciphers

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