Image of a brain cheering

CryptoHack

A free, fun platform for learning modern cryptography

Image of a cloud pouring information into a head

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.

Level up image of a warrior

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?

New ideas in development

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
Do you have good eyes? (Breizh CTF) CTF Archive 0
RSATogether (ECSC 2024 (Italy)) CTF Archive 0
Authentification 1 (Breizh CTF) CTF Archive 0
One Round Crypto (ECSC 2024 (Italy)) CTF Archive 0
Greatest Common Multiple (CODEGATE CTF) CTF Archive 0
Weekly Top Users
#1 Harachili 10090
#2 coconut 2820
#3 FrancoErmasi 2565
#4 s4hm4d 2490
#5 Daytime 2110
Recent Solves
Finding Flags flesh
Base64 Sribabu
Generators of Groups Manawolv
Bytes and Big Integers Mgabo
XOR Properties Hackr101
Recent Solutions
Static Client 2 ic3d_lemon 0
Noise Cheap ic3d_lemon 0
Missing Modulus ic3d_lemon 0
Real Eisenstein dvck13 0
Quadratic Residues synackrst 0

Level Up

level up icon

You are now level Current level