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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 Kkameleon 2860
#2 tjade273 2815
#3 StephanAllen 2755
#4 App1e_Tree 2675
#5 Sisbox110 1630
Recent Solves
Round Keys lost_the_table
Hex S3vro
Structure of AES lost_the_table
Marin's Secrets limeeattack
Recent Solutions
L-Win k3w1k0d3r 0
Endless Emails randomaccount 0
RSA Starter 5 themarkib 0
RSA Starter 4 themarkib 0
Favourite byte daloskimarkuo 0

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