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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 MOUSEMOUG 3060
#2 CorsiDjib 3005
#3 Tristanous 2585
#4 hamza_sfaxi 2410
#5 ferrat 2370
Recent Solves
Legendre Symbol Pon9078
Modes of Operation Starter JonathanAlon
Monoprime Equinox134
Encoding Challenge benjamin1234
CERTainly not Rw_
Recent Solutions
Toshi's Treasure dvck13 0
Inferius Prime T4QI 0
Marin's Secrets AaronCrighton 0
Symmetry dolenstar 0
Flipping Cookie dolenstar 0

Level Up

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