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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 leider 5815
#2 K4tou 2485
#3 FieryBanana101 2380
#4 ryougi_shiki 2305
#5 veritas01 2060
Recent Solves
Too Honest bigboss
Extended GCD Liuxu
Real Eisenstein fluffypill0w
XOR Properties blueLittlecat
You either know, XOR you don't a_wild_leo
Recent Solutions
Size and Basis fssl 0
Gram Schmidt fssl 0
Confusion through Substitution alienkeric 0
Merkle Trees goreil 0
RSA or HMAC? diu 0

Level Up

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