Get a signed copy of De/cipher with a personal dedication. The book is a modern-day history of hacking, covering ancient transposition ciphers and methods of steganography through later advances, such as polyalphabetic systems.
This book looks at 45 of the world’s most important codes and ciphers, like the Great Cipher to the secure hash algorithm used today to verify online digital signatures, as well as introducing the reader to the greatest codebreakers in history.