The Man Who Broke Purple: The Life of Colonel William F. Friedman, Who Deciphered the Japanese Code in World War II

George Fabyan: The Tycoon Who Broke Ciphers, Ended Wars, Manipulated Sound, Built a Levitation Machine, and Organized the Modern Research Center

Cryptanalysis: A Study of Ciphers and Their Solution

The Voynich Manuscript

The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet

The Hut Six Story: Breaking the Enigma Codes

The Chinese Black Chamber: An Adventure in Espionage

Pursuit: The Chase and Sinking of the Battleship Bismarck

Battle Of Wits: The Complete Story of Codebreaking in World War II