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Table Of Contents Introduction What is a computer Virus How a Virus Infects History Of Viruses Virus Types File Virus Boot Virus Multi-Partite Virus Polymorphic Virus Virus Prevention Rule 1 Rule 2 Rule 3 Rule 4 Virus Statistics Trojans Worms Conclusion Diagrams Chris Ruci ITM 280 Dr Jeffries 14 Dec 2000 Computer Viruses Introduction If you buy a new computer these days its likely to be shipped with an anti-virus package This fact more than anything else should convince us of how widespread viruses have become and how much the computer industry has come to accept their inevitability Just like its biological reference computer virus acts like a biological virus in which it first is infected into the body and then spread Quite simply viruses are a fact of computing life What is a Computer Virus To be defined as a virus a program must Replicate itself in order to carry out a mission Be dependant on a host to carry out the mission Create damage to the computer system infected A computer virus is a piece of software that has been written to surreptitiously enter your computer system and infect your files Some viruses are benign and wont harm your system while others are destructive and can damage or destroy your data Typically a computer virus will replicate itself and try to infect as many files and systems as possible If your system is infected when you save a file to a disk you will probably infect the disk and in turn whoever uses that disk will infect their system As you can see its a vicious cycle not unlike the viruses that plague us humans Stewart New computer viruses are being written all the time and its important to understand how your system can be exposed to them and what you can do to protect your computer
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