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This book is about using computer networks to enable people to communicate with each other. Whilst there will no doubt be different forms of interaction, we will generally talk about the same subjects - work, play and the other parts of the rich fabric of our lives - as we do in face to face situations. Because we live in an imperfect world, we can thus expect the problems that come with communication to be the same as they have always been, such as fraud, eavesdropping and prevention of communication, along with new problems from using new technology, and changing relationships between people and technology. In this chapter, we focus upon the problems of security, and ensuring that the human goals of communication cannot be subverted by other people.