Data communication performance of Mobile Ad-hoc Networks (MANETs) gets adversely affected by presence of malicious nodes. In this paper, model for random On/Off switching, referred as selfish or malicious nodes has been used, with OLSR protocol and a simple trust strategy has been proposed to decide the trust of next hop node. Residual energy level of forwarding node is also continuously monitored and accordingly confidence level associated with the node has been determined. Continuously varying trust parameter and confidence levels of all forwarding nodes have been incorporated in the Hello and Topology Control (TC) message formats of standard OLSR protocol. Further, OLSR protocol has been modified using Trust and Confidence values of nodes. The proposed protocol, termed as OLSRT-C, has been used to select the optimum path for data forwarding. Simulations carried out on typical MANET scenario show that the proposed OLSRT-C protocol successfully mitigates randomized Selfish Behavior (SB) attack significantly with marginal increase in the Average Energy Consumption per node.

MANETs, Selfish Behavior attack, OLSR, Trust-Confidence routing, PDR, Routing Overheads, Average Energy Consumption

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