Since the age of technology arose, and the twentieth century of computers came about, there have always been an attempt from those trying to be “smarter” then the average computer, (or computer user, for that matter). It was the very famous Fred Cohen who "wrote the book" on computer viruses. He was the soul in the development of a theoretical, and mathematical model of computer virus behavior. He was able to use his logic to test several hypothesis about computer virus’s. Cohen's very own, and well-known, informal definition is "a computer virus is a computer program that can infect other computer programs by modifying them in such a way as to include a (possibly evolved) copy of itself". This does not mean that a computer has to undergo actual destruction(such as deleting or corrupting files) in order to be classified as a "virus" by Cohen’s definition. Many people use the term "virus" loosely to cover any sort of program that tries to hide its possible destructive functions and\or tries to spread onto as many computers as possible; leaving us with a long list of possibilities to deal with.
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