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Instead the tools, usually hijacked home computers, are being used to pump out junk e-mail. Often these hijacked PCs, known as bots, are used for "Distributed Denial of Service" (DDoS) attacks that attempt to knock a site or server offline by bombarding it with huge amounts of data.
For the full story go to:
http://news.bbc.co.uk/1/hi/technology/6623673.stm
DDoS attacks are just one of many IT vulnerabilities addressed in the IT Security session during Security Management Stage 1, 30 July – 10 August 2007.