Computer+Viruses-BG+&+WM-S

Computer viruses Description- A computer virus is a computer program that can replicate itself and spread from one computer to another. History- The first academic work on the theory of computer viruses was done in 1949 by John von Neumann who gave lectures at the University of Illinois about the “theory and Organization of complicated "Automata”. Also, in 1972 Veith Risak published an article. In 1984 Fred Cohen from the University of Southern California wrote his paper “Computer Viruses-Theory and Experiments”. The first creeper Virus was detected on ARPANET the forerunner of the internet in the 1970's. When the creeper Virus appeared, the message "I am the Creeper, Catch me if you can!" was displayed.

Impacts- Types-
 * It can slow down your computer.
 * It might corrupt your system files
 * it might make some programs faulty or corrupt
 * Trojan horses
 * Worms
 * Bootsector Virus
 * Macro Virus
 * Memory Resident Viruses
 * Rootkit Virus
 * Polymorphic Viruses
 * Logic bombs/ Time Bombs
 * Creeper Virus

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