The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Number Sequence — Part 10
Solved Level 1 challenge Number Sequence — Part 9
Solved Level 1 challenge Original Caesar Cipher
Solved Level 3 challenge Vinaigrette Signature Scheme
Solved Level 1 challenge A hidden word — Part 2
Solved Level 2 challenge BCR code (Book-Caesar-RSA)
Solved Level 1 challenge Number Sequence — Part 8
Solved Level 1 challenge Number Sequence — Part 6
Four degrees of difficulty, from pen & paper to complex mathematical problems