Trust-based Multipoint Relay Selection Algorithm for Enhancing Security in Mobile Adhoc Networks

Optimized Link State Routing (OLSR) is a in a popular proactive routing protocol for providing peer-to-peer transmissions in mobile ad hoc networks (MANETs). Since sensitive data are communicated in MANET, security remains a major issue. In this paper, we propose a trust based Multipoint Relay (MPR) selection algorithm for defending a specific type of denial-of-service (DOS) attack called node isolation attack. Our proposed approach is based on cross verifying the exactness of the received HELLO message from a neighbour node before designating it as MPR for this node. Our proposed MPR selection technique includes three main processes, viz. Initialization, Trust computation and Global trust computation. Experimental analysis reveals that our proposed approach defends the node isolation attack with better performance in terms of packet loss ratio, packet delivery ratio and packet overhead KeywordsOptimized Link State Routing(OLSR), Mobile Adhoc Network(MANET),Multi-point relay(MPR), network security, Node isolation attack.