Hyundo Park Peng Li Debin Gao Heejo Lee Robert H. Deng Distinguishing between FE and DDoS Using Randomness Check. 131-145 2008 ISC http://dx.doi.org/10.1007/978-3-540-85886-7_9 conf/isw/2008 db/conf/isw/isc2008.html#ParkLGLD08