Research Of DoS Attack On Multicast In Wireless Ad-Hoc Networks

Wireless Ad Hoc Networks (WAHN) is a type of dynamic autonomous networks in which a group of mobile nodes are collaborating with each other. WAHN can be constructed by wireless terminals temporarily without infrastructures and widely used in real world because of its easiness of construction and host mobility. Recently, researchers came to focus on multicast communication in WAHN due to the development of WAHN and the maturity of multicast technology. Thus, it is of great importance to continue our research on secure multicast in WAHN environment.Compared with the traditional unicast communication, the system structure of multicast and inherent characteristics of WAHN bring much more secure risks toward multicast communication and even make it more susceptible to DoS attack, involving the interior and exterior attack on multicast. Therefore, the research objectives of this paper are,on one hand, to analyze the characteristics and specific secure requirements of multicast communication in WAHN and describe two DoS flooding attack models-TCP SYN flooding and UDP flooding. Through the comparative analysis between the two attack models and simulation experiments, a conclusion that different attack models will bring on different results has been made. On the other hand, two defense strategies-strategy based on priority and revocation list strategy are proposed. Based on the comparative analysis of simulation results, the defense strategies can not only defend the DoS flooding attack on multicast effectively and enhance the network performance in aspects of network throughput and the average packet delay, but also substantiate our supposed conclusions.