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Overview:
This paper will explain what is virus, Trojan Horse, worm and gives examples of each one. A virus is a parasitic program written to intentionally enter a computer without the user's permission or knowledge. Besides being a large wooden horse used in the Trojan war 2500 years ago (and more recently by Brad Pitt), a Trojan Horse or Trojan is a computer program that seems innocuous or harmless, but conceals another more nasty function. A Worm is a self-propagating program that works its way through a system or network (like the Internet), often causing damage.
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