Computer security can be described in two different ways: keeping users away from dangerous things, or enabling users to do useful things safely. The former perspective is attack-oriented; the latter is task-oriented. In the attack-oriented mindset, users trudge along a dark path through the jungle, fraught with perils at every turn: viruses, Trojan horses, spyware, and email scams are the deadly snakes and poisonous spiders of computer security. Like a guardian angel, from time to time security software swoops down to vanquish the enemy or stop the user from doing something stupid. This is the picture that the news…
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