The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge Flawed Usage of a OTP Cipher by the BND
Solved Level 3 challenge The Heavy T52 Sturgeon Challenge — Part 6
Solved Level 3 challenge The Heavy T52 Sturgeon Challenge — Part 5
Solved Level 3 challenge The Heavy T52 Sturgeon Challenge — Part 4
Solved Level 1 challenge Number Sequence — Part 2
Solved Level 1 challenge Number Sequence
Solved Level 2 challenge AES ECB Wrong Encoding
Solved Level 1 challenge Snow White and the seven dwarfs
Four degrees of difficulty, from pen & paper to complex mathematical problems