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Trust enhanced secure multi-path routing protocol for detecting and mitigating misbehaving nodes

Security in infrastructure-less networks like MANETs (Mobile Ad Hoc Networks) has proven to be a challenging task. Inherently secure routing protocols is a must for operational continuity of such networks. A number of secure routing protocols based on trust have recently been proposed. These protocols use the traditional route discovery model where along with normal nodes misbehaving nodes also participate in the route discovery process to incapacitate the network. To avoid the participation of misbehaving nodes, a secure and efficient route to destination can be calculated using weighted average of the number of nodes in the route and their trust values. However, the challenge is to minimize overhead of the above weighted average based routing technique while ensuring good throughput. In this paper we propose efficient trust based multi-path dynamic source routing protocol (TMDSR). Unlike previous approaches which are based on broadcast and hence ignore the path from one hop neighbor of destination, the protocol proposed in this paper consider such path as it uses unicasting of route discovery packet from one hop neighbor of destination. Results show that our method increases the throughput of the network while minimizing the routing overhead.