The term "computer virus" was coined in the early 1980s. Fred Cohen, then a Ph.D. student at the University of Southern California, came up with the idea of using self-replicating software, which spreads by attaching itself to existing programs as a way of attacking the security of multi-user computing systems. He showed this idea to Len Adleman, his thesis advisor. Adleman pointed out the similarity to a biological virus, which uses the resources of the cell it attacks to reproduce itself, and the term "computer virus" began its journey into everyday English.
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