The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge ADFGVX — Part 1
Solved Level 2 challenge Advent Challenge — Part 4
Solved Level 1 challenge Trifid Cipher
Solved Level 2 challenge Wheatstone Cryptograph — Part 2
Solved Level 2 challenge Lightweight Introduction to Lattices — Part 3
Solved Level 2 challenge Advent Challenge — Part 3
Solved Level 2 challenge Advent-Challenge — Part 2
Solved Level 1 challenge Advent-Challenge — Part 1
Four degrees of difficulty, from pen & paper to complex mathematical problems