The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge New Year's Greetings — Part 3
Solved Level 1 challenge New Year's Greetings — Part 2
Solved Level 1 challenge New Year's Greetings — Part 1
Solved Level 2 challenge ASAC — A Strong(er) ADFGVX Cipher — Part 2
Solved Level 2 challenge ASAC — A Strong(er) ADFGVX Cipher — Part 1
Solved Level 1 challenge ADFGVX — Part 2
Solved Level 1 challenge ADFGVX — Part 1
Solved Level 2 challenge Advent Challenge — Part 4
Four degrees of difficulty, from pen & paper to complex mathematical problems