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The New School of Information Security by Adam Shostack, Andrew Stewart

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Chapter 2. The Security Industry

Imagine that the police have arrested two people, Alice and Bob, for a crime. The police don’t have enough evidence to convict either, so they hope to convince each to testify against the other. If Alice testifies against Bob, but he doesn’t testify against her, he’ll go to jail for ten years, and she’ll go free. If they testify against each other, they’ll both go to jail for five years. If they both remain silent, they’ll each serve six months on a minor charge. The police offer Alice and Bob the same deal, but each must make his or her decision in a lonely cell. Each one’s fate, and the fate of the other, lies in their hands.

Several factors might influence their decisions. For instance, they might be friends. ...

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