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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 3575
#2 sontran999123 3300
#3 nomemio 2790
#4 medb 2645
#5 redsti 2090
Recent Solves
Marin's Secrets Fatekeeper
ECB Oracle AbuHunter
Square Eyes redsti
Noise Cheap Nhan_LAPTOP
Bruce Schneier's Password LittleNoPro
Recent Solutions
XOR Properties Gvriel 0
SSH Keys Papascruff 0
Privacy-Enhanced Mail? Papascruff 0
Quadratic Residues Papascruff 0
Greatest Common Divisor Und3aD_gh0sT 0

Level Up

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