Applied Cryptography: Protocols, Algorithms and Source Code in C by Bruce Schneier |
Handbook of Applied Cryptography (Discrete Mathematics and Its Applications) by Alfred J. Menezes |
The Code Book: The Secret History of Codes and Code-breaking by Simon Singh |
Security Engineering: A Guide to Building Dependable Distributed Systems by Ross J. Anderson |
A Course in Number Theory and Cryptography (Graduate Texts in Mathematics) by Neal Koblitz |















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