The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 2 challenge Pigpen with a twist — Part 2
Solved Level 1 challenge Number Sequence — Part 4
Solved Level 2 challenge Double Column Transposition — Part 2
Solved Level 1 challenge Lightweight Introduction to Lattices — Part 1
Solved Level 1 challenge Bigram Substitution – Part 1 (Tutorial)
Solved Level 1 challenge Number Sequence — Part 7
Solved Level 1 challenge Pigpen with a twist — Part 1
Solved Level 3 challenge RSA with Special d
Four degrees of difficulty, from pen & paper to complex mathematical problems