The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Merkle-Hellman Knapsack Challenge - Part 1
Solved Level 2 challenge Pigpen with a twist — Part 3
Solved Level 1 challenge One-Time Pad with Flaws
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 5
Solved Level 1 challenge Enigma Messages
Solved Level 3 challenge The Heavy T52 Sturgeon Challenge — Part 2
Solved Level 1 challenge Merkle-Hellman Knapsack Challenge - Part 1
Solved Level 1 challenge Enigma Messages with Repeated Letters — Part 3
Four degrees of difficulty, from pen & paper to complex mathematical problems