The Security Routing Protocol For Defending Against False Accusation In Ad Hoc Networks

Ad hoc network is a special peer-to-peer network. Because of self-organization, dynamic topology and openness of wireless links, the routing protocol's security in ad hoc network is very important. In ad hoc network, nodes cooperate by forwarding packets for each other to keep communication. Therefore, preventing attacks from nodes is the key to make network operate normally. This paper mainly discusses the influence of network performance under internal attacks in ad hoc network and security routing protocol.To begin with, this paper divides the typical routing protocols of ad hoc network into three types based on routing strategy, and compares the advantages and disadvantages of each method. Then it introduces the security issues in wireless ad hoc network, surveys four kinds of security tactics. Subsequently, we addresses the existing research on the typical solutions of collusion attack which classified into four types: solutions based on cryptography,combination of cryptography and trust model solutions,Wormhole attack and Sybil attack solutions,other solutions, and makes a comparison and discussion of their respective merits and demerits. When analyzing the security routing protocols based on reputation system, we find that false accusation caused by one or more nodes is also universal existence. The effect of false accusation attack is examined by simulation. In order to resolve false accusation, we propose an Optimal Reputation Appraising Mechanism. It uses statistical method to calculate reputation and checks accusation message strictly, tries to avoid false accusation by malicious nodes. In order to inspirit cooperation, malicious nodes are punished by using second chance mechanism. The mechanism has the characters of distribution, cooperation and facility. Finally, we put forward a security routing protocol(ORAMDSR) to prevent false accusation by malicious nodes. The security routing protocol is described and simulated. The results of simulation show that ORAMDSR protocol has good performances when slander present.