Rescarch And Implementation Of Security Classification-based Encryption And Detection In Mobile Ad Hoc Networks

Mobile Ad Hoc Network is a group of wireless nodes that are distributed without relying on any standing network infrastructure. Owing to characteristics of open medium, dynamic topology and lack of centralized monitoring, the security of Mobile Ad hoc Network is more rigorous than that of traditional network. Mobile Ad hoc Network routing protocols are designed to accommodate the properties of a self-organized environment without protection against any inside or outside network attacks. Therefore, the security problem for mobile ad hoc networks is becoming one of the major issues to be solved.Ad Hoc on Demand Distance Vector Routing is an important Ad Hoc Network on-demand routing protocol. AODV has features of simplicity, maturity, popularity and availability in the research over the past few years. But it has no security mechanism, all participants are implicitly trusted to perform their assigned tasks faithfully. The security of AODV protocol is influence by malicious node attack. Secure routing protocols try to account for the possibility of nodes which may not follow the protocol or send deliberately misleading routing information.To address the security issues, the thesis presents a TCE-AODV security routing protocol based on encryption and detection of security classification. TCE-AODV makes improvements mainly from the following aspects:first, the D-S evidence theory is used to establish the TC trust model which can effectively evaluate the trust value of each node in Mobile Ad Hoc Networks. The thesis proposes a trusted routing protocol named TCE-AODV protocol based on the TC trust model. A node makes a routing decision according to the trust values of its neighbor nodes. TC trust model can be used to divide security classification and detect malicious nodes. Second, the thesis proposes an efficient RSA public key encryption scheme, which is improved the safety of lower security level. It will use the encryption algorithm for authentication to ensure the reliability of routing when the security level is low according to the above proposed security classification. Third, because the network uses encrypted authentication methods need to consume resources, we improve network security with a little overhead through the classification mechanism.This thesis gives a detailed description about TCE-AODV routing protocol and evaluates the TCE-AODV and AODV routing protocols based on the NS2network simulation software. The simulation results show that TCE-AODV is better than AODV in average end-to-end delay, routing lookup initiating frequency and Packet loss ratio.