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CryptoHack

A fun platform for learning modern cryptography

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Break Crypto

Get your hands dirty and learn about modern cryptographic protocols by solving a series of interactive puzzles and challenges.

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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
RSA or HMAC? Crypto on the Web 35
JWT Secrets Crypto on the Web 25
No Way JOSE Crypto on the Web 20
Jack's Birthday Hash Mathematics 20
Jack's Birthday Confusion Mathematics 30
Weekly Top Users
#1 alamot 4195
#2 neongen 4085
#3 Camaendir 1675
#4 GNZL 1445
#5 ironore15 1415
Recent Solves
JWT Sessions Aether
Token Appreciation Aether
ECB CBC WTF jeff07014
ECB CBC WTF dxdx
ECB Oracle dxdx
Recent Solutions
Infinite Descent g4l01s 0
Encoding Challenge Chittesh_X01B 0
Size and Basis EvaUnit02 0
Lemur XOR allfro 0
Favourite byte C3real 0

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