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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
Blind (ECSC 2023 (Norway)) CTF Archive 0
WOTS Up (ECSC 2023 (Norway)) CTF Archive 0
Irish flan (ECSC 2023 (Norway)) CTF Archive 0
WOTS Up 2 (ECSC 2023 (Norway)) CTF Archive 0
Twist and shout (ECSC 2023 (Norway)) CTF Archive 0
Weekly Top Users
#1 Zukane 1600
#2 Iuliep21 1370
#3 user632832 1255
#4 JoshuaL 1205
#5 koyphshi 1115
Recent Solves
Greatest Common Divisor janfkadkf
Privacy-Enhanced Mail? haniemyluv
You either know, XOR you don't janfkadkf
Favourite byte janfkadkf
XOR Properties janfkadkf
Recent Solutions
Marin's Secrets Moha_rd 0
Infinite Descent Moha_rd 0
Structure of AES RezaSi 0
Flipping Cookie eswarrame 0
ECB CBC WTF eswarrame 0

Level Up

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