Chapter 2. Elementary Cryptography
In this chapter:
Concepts of encryption
Cryptanalysis: how encryption systems are “broken”
Symmetric (secret key) encryption and the DES and AES algorithms
Asymmetric (public key) encryption and the RSA algorithm
Key exchange protocols and certificates
Digital signatures
Cryptographic hash functions
Cryptography—secret writing—is the strongest tool for controlling against many kinds of security threats. Well-disguised data cannot be read, modified, or fabricated easily. Cryptography is rooted in higher mathematics: group and field theory, computational complexity, and even real analysis, not to mention probability and statistics. Fortunately, it is not necessary to understand the underlying mathematics to be able ...
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