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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 MishaXaos 2200
#2 liorhaddad 2170
#3 Rayene9052 1985
#4 BBMTFAN 1950
#5 DexterJie 1940
Recent Solves
Decrypting TLS 1.2 zzzzzyx
Stream of Consciousness EmmanuelGoldberg
Favourite byte Gcz
Modular Arithmetic 2 lucky968
Base64 baha_12
Recent Solutions
Favourite byte Krieg 0
Dancing Queen SorcierMaheP 0
Static Client 2 Alfaepsilon 0
Oh SNAP T4QI 0
Toshi's Treasure dvck13 0

Level Up

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