GitHub, the social coding service, has been plagued by two days of distributed denial-of-service attacks.
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Some 29 institutions were affected by so-called distributed denial-of-service attacks (DDoS) which overload a site with data causing it to fall over.
Anderson said the U.S. may end up with a new type of weaponry for launching massive distributed denial-of-service attacks and computer viruses.
The recent rash of distributed denial-of-service attacks on large American banks has disrupted the delivery of banking services to consumer and commercial customers over the Internet for hours at a time.
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Russian hackers, meanwhile, took to the Net, launching waves of distributed denial-of-service attacks against the country's government, banking and media Web sites, using thousands of personal computers hijacked with hidden software to overload the servers.
"The attacks against Estonia and Russia were coordinated, deliberate, targeted denial of service attacks--using botnets and distributed denial of service attacks--against selected organizations and infrastructure within those countries, " he says.
Those included posting private data, including credit-card and Social Security numbers, of Web users and launching distributed denial-of-service (DDoS) attacks against media sites who posted stories they didn't like.
Security firm Sophos's blog said that the attacks were carried out by spreading links via Twitter and other parts of the internet which carried out distributed denial-of-service (DDoS) attacks.
The networks had been attacked by malicious codes, rather than distributed denial-of-service (DDoS) attacks as initially suspected.
Botnets are often used to mount distributed denial of service (DDoS) attacks - forcing websites offline - to run spyware or to send out spam emails.
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