DYNAMIC-TRUST MODEL FOR MONITORING MALICIOUS NODE OSCILLATING BEHAVIOR IN MANET USING SATISFACTION AND FEEDBACK CREDIBILITY

摘要

Routing in an mobile ad-hoc network (MANET) is an active research area in recent years. It still faces challenges such as limited physical security, node mobility, and limited resources such as bandwidth and storage. Trust plays a growing role if security in an open environment where unknown devices can join or leave the system at any time. In this paper, a suite of efficient secure routing protocol referred as Dynamic-trust model is developed, which will be based on the trust level of individual nodes within the ad-hoc network. The design of routing protocols for mobile ad-hoc networks rarely contemplates in most hostile environments. Consequently, it is common to add security extensions afterwards. One feasible way to minimize the threats is to evaluate the trust and reputation of the interacting neighbors. Many trust models have done so, but they fail to properly evaluate trust when malicious agents start to behave in an unpredictable way. Moreover, these models are ineffective in providing quick response to a malicious node's oscillating behavior. In this dynamic-trust model, security is inherently built into the routing protocol where each node evaluates the trust level of its neighbors based on a set of attributes. A secure route is established based on a confidence level prescribed by a user in terms of these attributes. Analytical and simulation results are presented to evaluate the performance of the proposed scheme.