The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge The SZ42 Challenge — Part 10
Solved Level 2 challenge The SZ42 Challenge — Part 9
Solved Level 2 challenge The SZ42 Challenge — Part 8
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 1
Solved Level 2 challenge The SZ42 Challenge — Part 7
Solved Level 2 challenge The SZ42 Challenge — Part 6
Solved Level 2 challenge The SZ42 Challenge — Part 5
Solved Level 2 challenge The SZ42 Challenge — Part 4
Four degrees of difficulty, from pen & paper to complex mathematical problems