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

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In transposition each letter retains its identity but changes its position, whereas in substitution each letter changes its identity but retains its position.
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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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