The Crypto Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Lightweight Introduction to Lattices — Part 2
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge An Invisible Message
Solved Level 1 challenge A hidden word — Part 2
Solved Level 1 challenge ¿No Hablas Español? No problemo!
Solved Level 2 challenge Cracking SHA1-Hashed Passwords
Solved Level 1 challenge From Russia with Love
Solved Level 1 challenge Number Sequence — Part 4
Four degrees of difficulty, from pen & paper to complex mathematical problems