Research On Trust Theory-Based Security Technologies Of Routing Protocol

With the development of Internet, the security of Internet becomes more and more important. As the key support of Internet, routing protocol (such as OSPF, DSR, AODV) becomes hot point of the research on network security technology. So the security research on routing protocol is of great significance for the whole Internet.Routing protocol is designed on the basis of the security network environment and lack of necessary security consider. In recent years, high frequency of routing protocol accidents indicates that routing protocol faces a lot of security threats from exterior and interior. To solve the security threats of routing protocol, scholars proposed several security solutions, including the solution based on cryptology and the solution based on trust theory. But the current routing security solutions have some defect to further improve. For example, the solution based on cryptology cannot prevent the hostile attack from the legal routing node or hijacked node, the trust solution only evaluates the node behavior with a coarse grain size and cannot be effective in eliminating the impact of malicious attack behavior and restrain the fraud recommendation behavior.As the mainstream and widely used routing protocol, security research of OSPF and MANET’s routing protocol has very great reference value for other protocols. As a result, we focus on the trust solution of OSPF and MANET’s routing protocol to solve the problem in routing security research. Without adding the additional hardware, the proposed solutions are novel and exploratory.The main innovations and contributions of the present thesis are as follows:(1) By studying the related issues of the router node trust, a dynamic trust model which considered state and behavior of the routing node was proposed. The model used the grey relation theory to calculate the dynamic trust in order to reflect the development of the trust change. The model solved the defect of former trust models and realized a fine grained trust evaluation. The simulation result showed that the proposed model can evaluate the node trust effectively and accurately with high dynamic response ability. On the basis of the dynamic trust model, a trusted routing algorithm was proposed. This algorithm used a modified greedy function to design a new greedy routing algorithm and realized more trusted routing path chooses. In addition, the trusted routing algorithm can effectively guarantee the creditability and stability of OSPF protocol with highly attack resistant properties.(2) Learning trust relationship from routing network, a Recommendation trust model based on Grey Clustering Theory in OSPF was proposed. Firstly, the proposed model introduced the recommend credible to evaluate trust of the recommendation node. Secondly, the model clustered the recommend node to different trust classes according to recommend credibility by grey cluster theory. Finally, the model calculated the recommendation trust by recommend credibility and recommendation node trust classes. The proposed model can not only effectively evaluate the routing node trust but also restrain the dishonest behavior of the malicious recommendation node. The simulation result showed that the proposed model can realized an exact trust evaluation with a better anti-deception performance and reduce the negative influence of the deceptive node.(3) A dynamic trust model in MANET based on multiple factors decision was proposed. The proposed model used multiple factors decision theory to solve the defect of former trust models by considering the state, behavior and trusted recommendation. The proposed trust model integrated four dimensional trust decision factors including behavior, state, recommend and node livens. The proposed model designed the improved entropy weight method to calculate the routing node trust and reflect the risk repugnance attitude. The experimental results show that the proposed model can reflect the node’s behavior and state change with high response ability. Under the existing of deceptive nodes, the model can restrain the deceptive behavior. In additional, the proposed model can guarantee the security and stability of MANET.(4) ZigBee is a successful application of MANET. To verify the practicability of the proposed model in (3), a trust routing protocol in ZigBee was designed and realized. This protocol used the proposed model in (3) to evaluate the routing node trust in ZigBee. The proposed protocol used the routing node trust as the main reference volume in routing discovery to make sure a trusted routing path can be built. In the protocol, the routing discovery algorithm, routing node trusts maintain algorithm and routing maintain algorithm were proposed. The protocol can guarantee the security and trust of ZigBee and maintain the stability and usability of ZigBee in the circumstances of existing malicious node.