The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Wheatstone Cryptograph — Part 1
Solved Level 1 challenge Cryptanalysis Hacking Puzzles — Part 2
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Original Caesar Cipher
Solved Level 2 challenge Handycipher — Part 10
Four degrees of difficulty, from pen & paper to complex mathematical problems