The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge Double Column Transposition — Part 4
Solved Level 1 challenge Lightweight Introduction to Lattices — Part 1
Solved Level 1 challenge Autokey Cipher
Solved Level 2 challenge Hill Cipher
Solved Level 1 challenge Autokey Cipher
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Bigram Substitution – Part 1 (Tutorial)
Solved Level 2 challenge Lattice Part 1
Four degrees of difficulty, from pen & paper to complex mathematical problems