the First Computer Virus and the Most Powerful Virus in History?

A computer virus is a computer program that can replicate itself and spread from one computer to another. The term "virus" is also commonly, but erroneously used, to refer to other types of malware, including but not limited to adware and spyware programs that do not have a reproductive ability.Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by other computers.

November 1983, at an international conference on computer security, the American scholar William Cohen for the first time clearly stated the concept of computer viruses, and for a demonstration.

Recognized as the world's first computer virus widespread in personal computer is the Brain virus born in early 1986 , the virus is written by Pakistan brothers, two brothers owned a computer company,sold their computer software programed by themselves for a living. At that time, the local software piracy was rampant, in order to prevent any unauthorized copying of software is, and to track in the end how many people in the illegal use of their software, so in early 1986, they programed a Brain virus, also known as "Pakistan" virus. The virus is running under the DOS operating system, spread by floppy disk, only attack copying the pirate software , attack the privates to eat the residual hard disk space.

Strongest in the history of the computer virus known as CIH, is a man named Chen Yinghao China Taiwan college students invented.

CIH infection Windows 95/98/ME operating systems such as the executable file that can reside in computer memory, and thus continue to infect other executable files.CIH The danger is that, once activated, it can cover the data on the host hard disk drive
and cause failure. It also has the ability to cover the host BIOS chip, so that led to the computer fail to boot.

Date a number of variants CIH trigger is exactly the Chernobyl nuclear power plant accident of the day, so it is also known as the Chernobyl virus. But it does not infect other operating systems such as Windows 2000 Windows XP/NT,now CIH is not a serious computer virus.

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