Cryptography is the study of how to mathematically encode and decode messages. The objective of this chapter and the next is to show you how to use cryptography as a tool to achieve some of the security goals we discussed in Chapter 1. A cryptographic primitive is an algorithm that can be used to, for example, encode or decode a message. In this chapter and the next, you’ll see how to use cryptographic primitives to achieve authentication, confidentiality, and message integrity.
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