An Algorithm of Detecting and Defending CC Attack in Real Time

The basic principle of CC attack is analyzed, then an algorithm of detecting and defending CC attack is proposed. Based on the characteristic of web page´s random distribution is destroyed by CC attack, the algorithm detects the attack occurring in real time according to the theory of information entropy, finds attack sources and blocks attack connection by taking the technology of HTTP redirection and Cookie. Finally a detection and defense system for CC attack based on netfilter framework is designed and implemented. Experimental results show that the accuracy, reliability and practicality of the algorithm are good.