Whenever our computer behaves strangely, the first thing that we suspect is that a virus has infected our PC. If your computer is connected to the Internet then most probably your suspicion will turn out to be true.
But virus is just one of the forms of intrusion. Computer intrusions can take several forms, including viruses, [...]

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U.S. researchers have come up with a technique that claims to be able to stop Internet worms within milliseconds of an outbreak.
The Proactive Worm Containment (PWC) system, as its inventors at Penn State University call it, uses no signatures to identify an attack. Instead it relies on the frequency of connections at a packet level, [...]

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