Martin Casado Pei Cao Aditya Akella Niels Provos Flow-Cookies: Using Bandwidth Amplification to Defend Against DDoS Flooding Attacks. 286-287 2006 IWQoS http://dx.doi.org/10.1109/IWQOS.2006.250484 conf/iwqos/2006 db/conf/iwqos/iwqos2006.html#CasadoCAP06