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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
wise sage (CTFZone) CTF Archive 0
What a Curve! (Breizh CTF) CTF Archive 0
GLP420 (HackTM CTF) CTF Archive 0
unrandom DSA (HackTM CTF) CTF Archive 0
kaitenzushi (HackTM CTF) CTF Archive 0
Weekly Top Users
#1 VZXeFMTUq4o 2900
#2 rickbonavigo 2655
#3 klmn 1805
#4 gilcu3 1765
#5 HackersLove 1555
Recent Solves
Bytes and Big Integers Cador
Hex Cador
Base64 ChowChow83
Hex ChowChow83
Recent Solutions
Encoding Challenge rust_chan 0
Moving Problems klmn 0
RSA Starter 6 chungdinh 0
Bruce Schneier's Password f0x00 0
LFSR Destroyer ConnorM 0

Level Up

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