Abstract
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The history of computer viruses has begun recently, but it has already become legendary. Almost everyone knows a few awesome fables about these creatures, but hardy anyone understands what computer virus is. Computer virus is an executable code able to reproduce itself. Viruses are an area of pure programming, and, unlike other computer programs, carry intellectual functions on protection from being found and destroyed. They have to fight for survival in complex conditions of conflicting computer systems. Viruses seem to be the only alive organisms in the computer environment, and yet another main goal is survival. That is why they may have complex crypting/decrypting engines, which is indeed a sort of a standard for computer viruses nowadays, in order to carry out processes of duplicating, adaptation and disguise
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