Chapter 2 of 4 · Cryptography 50%

🔡 A queen lost her head over a homemade cipher. Thomas Phelippes broke it by counting letters, and the same trick cracks any letter-swap in seconds. Can you?

A scrambled-alphabet cipher has 26! keys, so people call it unbreakable. It is not: E stays the most common letter whatever costume it wears. You'll brute-force Caesar and crack a monoalphabetic cipher with frequency analysis. 🔍

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Hash functions and collisions

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Cryptography