This book reveals the complexity and near unparalleled ingenuity of the code makers' craft. From the simplest beginnings to the remarkable, recent advances in quantum cryptography, codes and ciphers have challenged and intrigued people for millennia. In this book, you will find the principles behind many different code systems, find out why they have affected history, and have the opportunity to solve several codes for yourself. Includes detailed description of simple substitution codes, transpositions and frequency analysis, polyalphabetic substitution and secret scripts, homophonics, the enigma code, and the purple cipher, keypad ciphers and pager codes, quantum cryptography and the world's greatest unbreakable codes.