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A free, fun 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
Maybe Someday (GoogleCTF) CTF Archive 0
Hamiltonicity 2 (CryptoHack) CTF Archive 0
Fischlin's Transformation (CryptoHack) CTF Archive 0
OR Proof (CryptoHack) CTF Archive 0
Ticket Maestro (CryptoHack) CTF Archive 0
Weekly Top Users
#1 Blackash2023 4780
#2 ordirehv 4125
#3 Blupper 4100
#4 Kuruwa 3975
#5 maple3142 3475
Recent Solves
Let's Prove It SuperBeetleGamer
You either know, XOR you don't Dainslef
Great Snakes HongNhung
Hex ultramen
ASCII ultramen
Recent Solutions
Couples ConnorM 0
DLOG on the Surface Blupper 1
A True Genus Neobeo 0
The j-invariant 0xndavd 0
Prime Power Isogenies dperrin 0

Level Up

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