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A must-have book for secret agents in the making.Ever wondered how to make and crack codes and ciphers? Herbie Brennan's essential guide contains everything a serious cryptographer and code-buster needs, including:- Codebreaking methods, examples and tests- How to develop complex ciphers- Tools for encrypting messages, from invisible ink to computer pixels- A history of how codes and ciphers have developed, taking in the ancient Greeks, the Kama Sutra, the Enigma machine and computer ciphers And much, much more!Contains black-and-white illustrations throughout.