A look at the world of codes includes a history of how they have affected the world, from the World Wars to the death of Mary, Queen of Scots, and also looks at what the future holds for the field of cryptography.

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Simon Singh received his Ph.D. in physics from the University of Cambridge. A former BBC producer, he directed an award-winning documentary film on Fermat's Last Theorem that aired on PBS's "Nova" series, and wrote the bestselling book Fermat's Enigma. He lives in London, England.

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