Wednesday, December 19, 2012

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Tuesday, September 18, 2012

Software bugs

Most systems contain bugs or loopholes, which may be exploited by malware. A typical example is the buiffer-overrum weakness, in which an interface designed to store data, in a small area of memory, allows the caller to supply more data than will fit. This extra data then overwrites the interface's own executable structure In this manner, malware can force the system to execute malicious code by replacing legitimate code with its own payload of instructions (or data values) copied into live memory, outside the buffer area.
Originally, PCs had to be booted from floppy disks. Until recently it was common for a computer to boot from an external device by default boot device. This meant that a live floppy disk or CD could subvert the computer during booting and boot into a modified operating system.

Malware

Malware, short for malicious software is software used or created to disrupt computer operation, gather sensitive information, or gain access to private computer systems. It can appear in the form of code script active content, and other software. 'Malware' is a general term used to refer to a variety of forms of hostile, intrusive, or annoying software
Malware includes computer virus worms,Trojan,horses  spyware ad ware and other malicious programs. In law malware is sometimes known as a computer contaminant, as in the legal codes of several U.S.states . Malware is not the same as defective software, which is software that has a legitimate purpose but contains harmful bugs that were not noticed before release. However, some malware is disguised as genuine software, and may come from an official company website. An example of this is software used for harmless purposes that is packed with additional tracking software that gathers marketing statistics.

computer virus

The computer is also not free from  the virus .A computer virus is a computer program It can replicate itself and spread from one computer to another. The term "virus" is also commonly, but erroneously, used to refer to other types o fmalware, including but not limited to adware and spyware programs that do not have a reproductive ability. The virus is harmful for a compute.The virus is protected by antivirus software which is found in market. the virus of computer may damage all the important data and program. It confuses us to operate computer. We can take to the computer virus as a disease which suffers the computer.

 Mal-ware includes computer viruses, dishonest  and other malicious or unwanted software, including true viruses. Viruses are sometimes confused with worms and Trojan horses, which are technically different. A worm can exploit security vulnerability to spread itself automatically to other computers through networks, while a Trojan horse is a program that appears harmless but hides malicious functions.

 

Sunday, August 5, 2012

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