CHAPTER        7


In this chapter, we introduce cryptography and encryption applications. To begin with, we use encryption as a way to protect individual files. We examine the following topics:

•  Encryption fundamentals, including cryptanalysis

•  Building blocks for computer-based encryption

•  Features and properties of effective file encryption

•  Digital rights management

7.1 Protecting the Accessible

In the previous chapters, we rely on physical and logical security measures to protect our information. These measures are not always enough. For further protection, we can use encryption to hide a file’s contents from others. Encryption is one of several techniques classed as cryptography (“secret writing”). ...

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