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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 2885
#2 adib 2420
#3 ccbeginner 1740
#4 kencho 1415
#5 peach_lasagna 1395
Recent Solves
RSA Starter 2 damianr1602
Lemur XOR kikko
Monoprime r0da
RSA Starter 1 damianr1602
Inferius Prime r0da
Recent Solutions
Bringing It All Together tico88612 0
Bean Counter epistemologist 0
Symmetry epistemologist 0
Script Kiddie epistemologist 0
Static Client 2 epistemologist 0

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