The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
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
Solved Level 2 challenge The Josse Challenge – Part 3
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Wheatstone Cryptograph — Part 1
Solved Level 2 challenge The Josse Challenge – Part 2
Four degrees of difficulty, from pen & paper to complex mathematical problems