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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 RocioAranibar 6430
#2 mnovoa 6235
#3 ciphermalware 3025
#4 raphyyzzz 2555
#5 Aryoksss 2510
Recent Solves
Inferius Prime CristFlores1
Signing Server KSokolov
Favourite byte perfectblue
RSA or HMAC? Part 2 matiasmunar_
JSON in JSON matiasmunar_
Recent Solutions
Manyprime Mashi 0
Monoprime Mashi 0
Factoring Mashi 0
RSA Signatures Mashi 0
RSA Decryption Mashi 0

Level Up

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