Radware has said in a new report that online group of coders called, Anonymous is to be blamed for bringing the distributed denial-of-service (DDoS) attacks to the main stream in 2011.

Anonymous had launched a series of DdoS attacks against sevetal targets in 2011 under a long running campaign called Operation Payback. The operation asked inder users to participate from around the world to cripple websites of the companies it believed were against free speech.

Anonymous had launched a series of attacks on sites that banned the whistle blower website, WikiLeaks. The hackers attacked MasterCard, Visa and PayPal that had removed people's ability to donate money to WikiLeaks in an attempt to block access to the companies' Web sites and services, under Operation Payback. The group had said that it is not linked with WikiLeaks but supports similar reasons. It says it wants transparency and counters censorship.

"Their major campaign, Operation Payback, during the WikiLeaks saga in December 2010--against those supporting the U. S. government--was the turning point that shaped the security scene in 2011," the Radware report said.

The attacks from the group are known for being very organized even all of its members are not hackers themselves, they simple use developed tools and follow the information about which site to attack and when through chat channels and other online forums.