The Crypto Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Modular Sequences
Solved Level 1 challenge Autokey Cipher
Solved Level 1 challenge Polyhomophonic Substitution — Part 1
Solved Level 1 challenge Find the right route — Part 1
Solved Level 1 challenge Alberti Challenge — Part 1
Solved Level 1 challenge Cryptanalysis Hacking Puzzles — Part 2
Solved Level 1 challenge A disguised code
Solved Level 1 challenge Modified Caesar Cipher
Four degrees of difficulty, from pen & paper to complex mathematical problems