Dynamic Trust Based Method to Mitigate Greyhole Attack in Mobile Adhoc Networks

Abstract

Effective mitigation against the security attacks in the mobile adhoc network is a challenging job. A new routing protocol based on the trust model is proposed and analysed in this article. Here each node calculates trust value and association status for all its neighboring nodes through monitoring its behavior in the network. Then this trust model is integrated into the Dynamic Source Routing (DSR) protocol which is the most common on demand routing protocol used in MANET. In the proposed scheme the route is not selected on the basis of first arrival of RREP and waits till it gets the RREP from all neighboring nodes and decides the path to be routed based on the nature of Association between them. Thus the Greyhole nodes will be identified and will not be given preference in the route selection. The performance the proposed protocol is evaluated by comparing the simulation results of it with the standard DSR in presence of Greyhole nodes. The simulation results demonstrate that the proposed routing protocols can effectively detect Greyhole Nodes and isolate them from routing.