The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge A really long number sequence
Solved Level 1 challenge Number Sequence — Part 10
Solved Level 1 challenge Number Sequence — Part 9
Solved Level 1 challenge Number Sequence — Part 8
Solved Level 1 challenge Number Sequence — Part 5
Solved Level 1 challenge Number Sequence — Part 4
Solved Level 2 challenge The Hutton Cipher – Part 4
Solved Level 3 challenge Vinaigrette Signature Scheme
Four degrees of difficulty, from pen & paper to complex mathematical problems