Chapter 1 of 1 · Cryptography 100%

🔓 That 'encrypted' session cookie? One free tool spells out user=admin;role=root in a second. No key, no cracking, just decoding.

Base64 and hex look scrambled, so people treat them like encryption. They are not: anyone reverses them in seconds. You'll learn to spot and peel encoding layers by hand and with CyberChef, the move every crypto challenge opens with. 🧩

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Encoding and encryption

1 ~30 min

Substitution ciphers

Soon Available Aug 23, 2026

The Vigenere cipher

Soon Available Aug 24, 2026

XOR cryptanalysis

Soon Available Aug 25, 2026

Hash functions and collisions

Soon Available Aug 26, 2026

Block cipher modes

Soon Available Aug 27, 2026

RSA fundamentals

Soon Available Aug 28, 2026

RSA attacks

Soon Available Aug 29, 2026

Key exchange and randomness

Soon Available Aug 30, 2026

Cryptography in the wild

Soon Available Aug 31, 2026