The Crypto Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge A modified homophonic cipher with reduced alphabets — Part 2
Solved Level 2 challenge Brute-Force-Attack on Triple-DES with Reduced Key Space
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Alberti Challenge — Part 1
Solved Level 1 challenge A disguised code
Solved Level 1 challenge Advent-Challenge — Part 1
Solved Level 1 challenge The Syllabary Cipher – Part 1
Four degrees of difficulty, from pen & paper to complex mathematical problems