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.
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.
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.
This so-called Distributed Denial of Service (DDoS) attack relies on having enough users, voluntary or not, to flood a site with so much traffic that it gets shunted offline.
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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.
In a tweet on its Twitter feed, MTGox said it was fighting off a distributed denial-of-service (DDoS) attack, which involves a site being bombarded with huge amounts of data.
One of the Internet Protocol (IP) addresses used to break into Nonghyup's system was the same as one used in March for a distributed denial-of-service (DDoS) attack that originated in North Korea, they added.
It also offers a range of security services, including managed DNS, Distributed Denial of Service (DDoS) mitigation and cyber-threat reporting.
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Cory Doctorow has recently written a thought-provoking piece for Make about the nature of distributed denial of service (DDoS, flooding a website with illegitimate traffic to cause it to crash) as a form of political protest.
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