Denial-of-service Attack | featured news

Anonymous wants PayPal users to "immediately close their accounts and consider an alternative," as a way of protesting the arrests of 14 people tied to a denial-of-service attack on PayPal's website last December.

The FBI today raided several homes in New York and California as part of an ongoing investigation into recent distributed denial of service (DDoS) attacks allegedly launched by members of the Anonymous hacking group.

The website for MasterCard suffered severe technical problems early Wednesday, possibly becoming the latest target of hackers supporting WikiLeaks founder Julian Assange.

The popular social networking site Twitter has been hit by a denial of service attack, according to Twitter co-founder Biz Stone. In an e-mail to CNN.com, Stone said this morning's attack is not related to a recent incident in which a hacker stole internal documents from the site. Twitter's site went down around 9:30 a.m. ET.

More than two dozen Internet sites in South Korea and the United States including the White House were attacked and some disabled by hackers possibly linked to North Korea, South Korea's spy agency said on Wednesday.

A widespread and unusually resilient computer attack that began July 4 knocked out the Web sites of several government agencies, including some that are responsible for fighting cyber crime, The Associated Press has learned.