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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 Triode 4075
#2 infernosalex 3660
#3 striving 3530
#4 ECM 2245
#5 milaiscute 2165
Recent Solves
Network Attacks ensy
No Way Back Home croc_or_crack
Computing Shared Secrets li_sen
Oofbleck (Firebird Internal CTF) levihackerman102
Quadratic Residues ilGeo
Recent Solutions
Ticket Maestro (CryptoHack) klmn 0
Computing Shared Secrets KOREONE 0
Computing Public Values KOREONE 0
Generators of Groups KOREONE 0
Quadratic Residues KOREONE 0

Level Up

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