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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 avktech78 2700
#2 ccbeginner 2035
#3 adib 2000
#4 kencho 1765
#5 ucasqsl 1710
Recent Solves
Finding Flags TheGreatest
Network Attacks 9oub3a
Diffie-Hellman Starter 5 ERIQUIER
Manyprime ERIQUIER
Bytes and Big Integers zimhacker22
Recent Solutions
Parameter Injection heabi 0
Diffie-Hellman Starter 4 heabi 0
Modulus Inutilis heabi 0
Monoprime heabi 0
RSA Starter 6 heabi 0

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