The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Original Caesar Cipher
Solved Level 2 challenge The SZ42 Challenge — Part 1
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge Autokey Cipher
Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport
Solved Level 1 challenge Original Caesar Cipher
Solved Level 2 challenge Factorization Cipher — Part 2
Solved Level 1 challenge Factorization Cipher — Part 1
Four degrees of difficulty, from pen & paper to complex mathematical problems