1 Introduction
Computer attacks happen each and every day. Simply connect an innocuous computer to the Internet, and someone will try to pry into the machine three, five, or a dozen times every 24 hours. Even without any advertisements or links bringing attention to it, attackers looking for vulnerable prey will constantly scan your machine or pummel you with e-mail trying to trick you into opening an innocuous-appearing attachment. If the computer is used for actual business purposes, such as a commercial, educational, not-for-profit, or even military system, it will get even more attention from the bad guys.
Many of these attacks are mere scans looking for particularly weak prey. Others are really sophisticated computer break-ins, which occur ...
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