The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge M-138 — Part 2
Solved Level 1 challenge M-138 — Part 1
Solved Level 1 challenge Advent-Challenge — Part 1
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Lightweight Introduction to Lattices — Part 2
Solved Level X challenge Ku Klux Klan
Solved Level 2 challenge Twisting the Rubik's Cube
Solved Level 2 challenge The Syllabary Cipher – Part 2
Four degrees of difficulty, from pen & paper to complex mathematical problems