Daniel Dantas
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The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography, by Simon Singh

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One of the features of the Enigma machine was its inability to encipher a letter as itself, which was a consequence of the reflector.
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The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography
The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography
by Simon Singh
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