The Crypto Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Advent-Challenge — Part 1
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge A hidden word
Solved Level 1 challenge Caesar Encryption
Solved Level 2 challenge The T52 Sturgeon Challenge — Part 9
Solved Level 1 challenge Number Sequence — Part 2
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Number Sequence
Four degrees of difficulty, from pen & paper to complex mathematical problems