The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Number Sequence — Part 2
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge Assembly Point – Part 1
Solved Level 2 challenge Monoalphabetic Substitution with Camouflage — Part 5
Solved Level 1 challenge Assembly Point – Part 1
Solved Level 1 challenge Number Sequence — Part 4
Four degrees of difficulty, from pen & paper to complex mathematical problems