基于網(wǎng)絡(luò)行為分析的DDoS攻擊檢測技術(shù)研究
[Abstract]:With the rapid development of the Internet in recent years, more and more application-level services and applications, including Web services, have been developed and used. The security problem of application layer is becoming more and more prominent, and its security importance is becoming more and more important. Network attacks based on Web server occur frequently. Distributed denial of service attack (DDoS) is one of the most difficult and destructive attacks. DDoS is a network attack that prevents users from accessing the target service by consuming target resources. It poses a great threat to the availability of network and network services. Compared with traditional DDoS, DDoS attack based on application layer has better hiding effect and stronger destructive power. DDoS attack detection is an important part of the whole security prevention system. Accurate detection and identification of attacks to provide effective support for security defense. Most of the existing DDoS detection methods are difficult to distinguish the attacker's attack behavior from the burst large traffic normal request behavior. The detection method based on network behavior analysis can better identify the attacker's abnormal behavior. Therefore, it is necessary to study the DDoS detection method based on network behavior analysis. According to the different ways of selecting URL when attackers launch DDoS attack on Web server, this paper divides the DDoS attack against application layer Web service into three types: fixed URL attack, random URL attack and traversing URL crawler mode attack. The request rate of URL in each attack is analyzed, the URL of the request is regarded as a discrete random variable, the URL request entropy of the attack is obtained and compared with the normal URL request entropy, so as to find out the difference of the behavior of the DDoS attack. On this basis, the detection results are further analyzed and optimized, and a DDoS attack detection method based on the URL joint information entropy vector is proposed. The detection method combines the URL request entropy with the page residence time entropy vector. Simulation results show that the proposed method can effectively distinguish DDoS attacks from normal burst large traffic Flash Crowd access. Finally, through the research and analysis of the current mainstream DDoS attack tools, based on the Web system based on the service-oriented architecture of the laboratory, the feasibility and effectiveness of the detection method are tested by simulation experiments. The experimental results show that the joint information entropy vector detection method based on network behavior analysis can significantly reduce the false detection rate for DDoS detection.
【學(xué)位授予單位】:沈陽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TP393.08
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