Unformatted text preview: own privacy; cryptography products may be declared illegal, but the information will never be. How to Read This Book
I wrote Applied Cryptography to be both a lively introduction to the field of cryptography and a comprehensive reference. I have tried to keep the text readable without sacrificing accuracy. This book is not intended to be a mathematical text. Although I have not deliberately given any false information, I do play fast and loose with theory. For those interested in formalism, there are copious references to the academic literature. Chapter 1 introduces cryptography, defines many terms, and briefly discusses precomputer cryptography. Chapters 2 through 6 (Part I) describe cryptographic protocols: what people can do with cryptography. The protocols range from the simple (sending encrypted messages from one person to another) to the complex (flipping a coin over the telephone) to the esoteric (secure and anonymous digital money exchange). Some of these protocols are obvious; others are almost amazing. Cryptography can solve a lot of problems that most people never realized it could. Chapters 7 through 10 (Part II) discuss cryptographic techniques. All four chapters in this section are important for even the most basic uses of cryptography. Chapters 7 and 8 are about keys: how long a key should be in order to be secure, how to generate keys, how to store keys, how to dispose of keys, and so on. Key management is the hardest part of cryptography and often the Achilles’ heel of an otherwise secure system. Chapter 9 discusses different ways of using cryptographic algorithms, and Chapter 10 gives the odds and ends of algorithms: how to choose, implement, and use algorithms. Chapters 11 through 23 (Part III) list algorithms. Chapter 11 provides the mathematical background. This chapter is only required if you are interested in public–key algorithms. If you just want to implement DES (or something similar), you can skip ahead. Chapter 12 discusses DES: the algorithm, its history, its security, and some variants. Chapters 13, 1...
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- Fall '10
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