What is computer virus?

One might think of a computer virus as a tiny computer program designed
to perform mischief. Most computer users have heard about computer viruses.
A computer virus is the result of a destructive program that someone has
written and placed inside a computer program, which unsuspecting people
then place in their computer system... >>Read more

Hacking Techniques in Wireless Networks

This article describes IEEE 802.11-specific hacking techniques that attackers have used, and suggests various defensive measures. We describe sniffing, spoofing and probing in the context of wireless networks. We describe how SSIDs can be determined, how a sufficiently large number of frames can be collected so that WEP can be cracked. We show how easy it is to cause denial-of-service through jamming and through forged disassociations and deauthentications. We also explain three man-in-the-middle attacks using wireless networks. We give a list of selected open-source tools. We summarize the activity known as war driving. We conclude the article with several recommendations that will help improve security at a wireless deployment site.>>readmore

Computer Virus

From Wikipedia, the free encyclopedia

A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. The original may modify the copies or the copies may modify themselves, as occurs in a metamorphic virus. A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or carrying it on a removable medium such as a floppy disk, CD, USB drive or by the Internet. Additionally, viruses can spread to other computers by infecting files on a network file system or a file system that is accessed by another computer. Viruses are sometimes confused with computer worms and Trojan horses. A worm, however, can spread itself to other computers without needing to be transferred as part of a host. A Trojan horse is a file that appears harmless until executed. read more...

A World Wthout Computer. What would happen?

A computer is a machine for manipulating data according to a list of instructions.

Computers take many physical forms. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers.[1] Today, computers can be made small enough to fit into a wrist watch and be powered from a watch battery. Society has come to recognize personal computers and their portable equivalent, the laptop computer, as icons of the information age; they are what most people think of as "a computer". However, the most common form of computer in use today is by far the embedded computer. Embedded computers are small, simple devices that are often used to control other devices—for example, they may be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and even children's toys.


A computer in a wristwatch.The ability to store and execute programs makes computers extremely versatile and distinguishes them from calculators. The Church–Turing thesis is a mathematical statement of this versatility: Any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, computers with capability and complexity ranging from that of a personal digital assistant to a supercomputer are all able to perform the same computational tasks as long as time and storage capacity are not considerations.