Colin Dixon Thomas E. Anderson Arvind Krishnamurthy Phalanx: Withstanding Multimillion-Node Botnets. 45-58 2008 NSDI http://www.usenix.org/events/nsdi08/tech/full_papers/dixon/dixon.pdf conf/nsdi/2008 db/conf/nsdi/nsdi2008.html#DixonAK08