The website of prominent security blogger Brian Krebs is back online this week after sustaining one of the largest distributed denial of service attacks in Internet history. DDoS attacks typically disrupt service at a website by flooding it with junk traffic. In this case, garbage traffic assaulted Krebs' site at 620 gigabits per second. By comparison, consumer bandwidth is in the 10-15 megabit per second range; businesses, 100 Mbps to 1 Gbps. The attack may have been even larger than reported so far, maintained Matthew Prince, CEO of Cloudflare.