On November 3, 1983, Frederick Cohen, a student at the engineering school of the University of Southern California (USC), was sure that a malicious program could be used to exploit any connected system, but he wondered how long it would take for the code to do so. He prepared a prototype that – after eight hours of hard work on a VAX 11/750 system running Unix – was ready to be shown at the weekly security seminar he attended.

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