The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge Double Column Transposition — Part 3
Solved Level 2 challenge ASAC — A Strong(er) ADFGVX Cipher — Part 2
Solved Level 2 challenge Cascading Encryption — Part 3/3
Solved Level 2 challenge Cascading Encryption — Part 2/3
Solved Level 1 challenge A hidden word
Solved Level 1 challenge Number Sequence — Part 3
Solved Level 1 challenge Number Sequence — Part 10
Solved Level 1 challenge Beaver Code
Four degrees of difficulty, from pen & paper to complex mathematical problems