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A fun, free 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
RSA or HMAC? Part 2 Crypto on the Web 100
Roll your Own Mathematics 125
Dancing Queen Symmetric Ciphers 120
SSH Keys General 35
LFSR Destroyer Misc 250
Weekly Top Users
#1 Serg 2175
#2 Dew 1530
#3 9Y0 1330
#4 zeski 1280
#5 kropotkin69 1260
Recent Solves
RSA Starter 3 ebalolongreyes
Favourite byte troystars
Resisting Bruteforce A_Rolando
RSA Starter 2 ebalolongreyes
XOR Properties troystars
Recent Solutions
XOR Properties V37R1X 0
ECB Oracle tritanngo99 0
ECB CBC WTF tritanngo99 0
Parameter Injection ATERMON 0
No Leaks ATERMON 0

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