Protection of Server from Proxy-Based DDoS Attack

Number of intermediate node i. e. proxy servers are lies between client and server. Due to this hierarchical organization of web proxy, existing system those were considered for DDoS attack detection was not able to preserve the Quality of Service of typical user as those are rudely rejects the all demands on DDoS attack detection. This affects on the quality of service of normal user because traffic from last proxy-to server may consists of attack traffic as well as regular traffic. Therefore, it is indispensable to ensure the QoS to normal user. Server side defense scheme that detects DDoS attack is implemented. This system protects the origin server from proxy based HTTP as well as HTTPS attacks. Soft control response mechanism solves the issues of QoS. It uses Hidden Semi Markov Model (HsMM) to analyze the traffic behavior. Pre-filtering at entry point is also proposed in this work to minimize the time require to check normality or abnormality of requests. Distributed denial of service, Hypertext transfer protocol, temporal locality and Spatial locality, Hidden semi-Markov model.