One of the trickiest things about stopping DDoS attacks is that hackers develop new variations on familiar themes. Researchers from Akamai’s DDoS mitigation service Prolexic detailed a 35 gigabit per second attack against one of its clients. Compared to the most powerful DDoS attacks, which have topped 1 terabit per second, that might not sound like a lot. But the attackers used a relatively new technique—one that can potentially yield a more than 15,000 percent rate of return on the junk data it spews at a victim.