Chapter 2 of 10 · Cryptography 20%

🔡 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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Cryptography

🔡 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?

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Ready to track your progress?

Course Progress

Course Chapters

Encoding and encryption

Substitution ciphers

The Vigenere cipher

XOR cryptanalysis

Hash functions and collisions

Block cipher modes

RSA fundamentals

RSA attacks

Key exchange and randomness

Cryptography in the wild