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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 sara2050 5025
#2 issoualamine 3815
#3 erraghay 3455
#4 DexterShaw 3195
#5 NeoCrypto 2485
Recent Solves
Finding Flags Glucose4650
Finding Flags nvenkatesh
You either know, XOR you don't MRx15
Legendre Symbol avk
Greatest Common Divisor CandleLighter
Recent Solutions
Salty strn 0
Encoding Challenge minutus 0
Montgomery's Ladder liquefy746 0
Point Addition liquefy746 0
Let's Prove It Again almantare 0

Level Up

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