The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Snow White and the seven dwarfs
Solved Level 1 challenge Cascading Encryption — Part 1/3
Solved Level 1 challenge Nils away on travel
Solved Level 1 challenge From Russia with Love
Solved Level 1 challenge Hill Cipher with Sudoku Key
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 1
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 2
Four degrees of difficulty, from pen & paper to complex mathematical problems