The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge The LoRa Cipher: Logic Randomness — Part 1
Solved Level 2 challenge Trendy Messenger
Solved Level 2 challenge Fastest in the West
Solved Level 2 challenge Breaking a Filter Generator
Solved Level 2 challenge A really long number sequence
Solved Level 1 challenge Lightweight Introduction to Lattices — Part 1
Solved Level 1 challenge The Book Code: A Challenge for Bookworms
Solved Level 1 challenge A hidden word — Part 2
Four degrees of difficulty, from pen & paper to complex mathematical problems