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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
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 cls 9135
#2 CommandMaster 6510
#3 IIJ_01_Aatif 2230
#4 KingofPiratez 2155
#5 Lelle 2135
Recent Solves
Public Keys BSBOX
Resisting Bruteforce idkkdi
Round Keys mhuyyho
Base64 1AnigmA6
Modular Exponentiation BSBOX
Recent Solutions
ECB Oracle _katana 0
ECB CBC WTF _katana 0
Passwords as Keys _katana 0
Bringing It All Together _katana 0
Diffusion through Permutation _katana 0

Level Up

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