Operation Payback organizers focused their attention on DDoS attacks on websites of companies that oppose WikiLeaks. PayPal, MasterCard and Visa services are getting DDoS attack since 8th of December. Last evening, a coordinated DDoS attack by Operation Payback brought down both the MasterCard and Visa websites. Earlier today Paypal website was victim of a Denial-of-service attack by Operation Payback.
Operation Payback : Operation Payback is a coordinated group of attacks on internet piracy opponents by internet activists. It started as retaliation to distributed denial of service (DDoS) attacks on torrent sites, piracy proponents decided to launch DDoS attacks on piracy opponents in return. Continue Reading on Wikipedia
Distributed Denial-of-service Attack : A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. Although the means to carry out, motives for, and targets of a DoS attack may vary, it generally consists of the concerted efforts of a person or people to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely. Continue Reading on Wikipedia