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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
Do you have good eyes? (Breizh CTF) CTF Archive 0
RSATogether (ECSC 2024 (Italy)) CTF Archive 0
Authentification 1 (Breizh CTF) CTF Archive 0
One Round Crypto (ECSC 2024 (Italy)) CTF Archive 0
Greatest Common Multiple (CODEGATE CTF) CTF Archive 0
Weekly Top Users
#1 Harachili 2350
#2 nomemio 2165
#3 berndoJ 1970
#4 coconut 1845
#5 IIJ_01_Aatif 1845
Recent Solves
Diffusion through Permutation tigerBoss101
Round Keys andreabbaby
XOR Properties JimChan
ECB CBC WTF thea123
Base64 gunlost
Recent Solutions
The Good, The Pad, The Ugly nomemio 0
Pad Thai nomemio 0
Quadratic Residues BobbyLiu 0
Oh SNAP nomemio 0
Confusion through Substitution numberFreak 0

Level Up

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