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In this chapter we discuss some of the basic elements of cryptography. This discussion will lay the foundation for the remaining crypto chapters which, in turn, underpin much of the material throughout the book. We'll avoid mathematical rigor as much as possible. Nevertheless, there is enough detail here so that you will not only understand the “what″ but you will also have some appreciation for the “how″ and “why.″

After this introductory chapter, the remaining crypto chapters focus on modern symmetric key cryptography, public key cryptography, and cryptographic hash functions. A handful of topics that are related to cryptography—but not exactly cryptography, per se—are also covered in later chapters.