In retaliation for refusing to let Mastercard customers donate to Wikileaks, 4Chan-based hackers and the Internet vigilante group Anonymous have successfully taken down the website of Mastercard.com with orchestrated DDOS attacks. The Anonymous-backed Operation Payback which is taking responsibility for these attacks, has also lead previous efforts against the RIAA. Operation Payback is organizing its WikiLeaks and Julian Assange support efforts through the @Anon_Operation Twitter account. Attacks have also hit Paypal and Swiss bank PostFinance and other sites which have refused service to Assange. EveryDNS.net, Visa as well as Amazon are also possible targets.
As of now, MasterCard is still working to resolve the issue. They are giving situation updates on their blog here : http://blog.securetrading.com/
Operation Payback is being followed by Operation Bank-Troll -- an online effort to spread a rumor through e-mail, Twitter, Facebook and other social media websites that MasterCard has been hacked and credit-card numbers have been leaked. But MasterCard has confirmed that the credit-card numbers posted are false.
Edited by Romeo29, 08 December 2010 - 08:24 PM.