Viruses, worms, trojan horses, and crackers all exis tand threaten the security of our computer systems. Often, we are aware of an intrusion only after it has occurred. On some occasions, we may have a fragment of code left behind × used by an adversary to gain access or damage the system. A natural question to ask is ÓCan we use this remnant of code to positively identify the culprit?Ô
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