Image of a brain cheering

CryptoHack

A fun, free 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
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
Great Snakes ChowChow83
XOR Starter cookiesnaps
Modular Arithmetic 2 nateguana
Finding Flags ChowChow83
Modular Arithmetic 1 nateguana
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

level up icon

You are now level Current level