The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Bigram Substitution – Part 1 (Tutorial)
Solved Level 1 challenge Alberti Challenge — Part 1
Solved Level 1 challenge Trifid Cipher
Solved Level 1 challenge Letter to the Templars — Part 2
Solved Level 1 challenge Letter to the Templars — Part 1
Solved Level 1 challenge Cryptanalysis Hacking Puzzles — Part 2
Solved Level 1 challenge Beaver Code
Four degrees of difficulty, from pen & paper to complex mathematical problems