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The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography $11.53 100 used & new from $3.37 (300)	C# 4.0 in a Nutshell: The Definitive Reference $30.42 58 used & new from $22.04 (25)	CEH Certified Ethical Hacker All-in-One Exam Guide $30.43 26 used & new from $25.99 (9)	Enigma $7.99 100 used & new from $0.01 (82)
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