The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge Lightweight Introduction to Lattices — Part 3
Solved Level 2 challenge ORYX Stream Cipher Part II
Solved Level 1 challenge Enigma Messages
Solved Level 2 challenge Pigpen with a twist — Part 3
Solved Level 2 challenge Pigpen with a twist — Part 2
Solved Level 2 challenge Fastest in the West
Solved Level 2 challenge Monoalphabetic Substitution with Nostradamus Flavor
Solved Level 2 challenge M-138 — Part 3
Four degrees of difficulty, from pen & paper to complex mathematical problems