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Cryptography
// 3 published field manuals
Cryptography challenges range from classical ciphers to modern misuses of RSA, AES, and hashing. The goal is rarely to break math — it is to spot the implementation mistake.
› field manual articles
- 01beginner
Classical Ciphers
Caesar, Vigenère, ROT13, and substitution — the ciphers CTF beginners meet first and how to crack them all.
- 02beginner
XOR Encoding
Understand XOR's role in CTF crypto — single-byte key recovery, repeating-key XOR, and the crib-drag attack.
- 03intermediate
RSA Basics
How RSA works mathematically, and the three beginner mistakes that make CTF RSA challenges solvable.