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Codebreaker’s Handbook

Herbie Brennan
Date Published
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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.


Herbie Brennan began a journalistic career at age eighteen and at twenty-four became the youngest newspaper editor in his native Ireland. He is now a full-time writer of fact and fiction for both adults and children, with several international bestsellers to his name. Combined sales of his books have passed seven million copies, and his work has appeared in more…

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