The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Letter to the Templars — Part 1
Solved Level 1 challenge Caesar Encryption
Solved Level 2 challenge AES ECB Wrong Encoding
Solved Level 2 challenge Double Column Transposition — Part 1
Solved Level 2 challenge Double Column Transposition — Part 3
Solved Level 1 challenge Alberti Challenge — Part 1
Solved Level 1 challenge The Syllabary Cipher – Part 1
Solved Level 1 challenge One-Time Pad with Flaws
Four degrees of difficulty, from pen & paper to complex mathematical problems