Enhanced Triple Umpiring System for Security and Performance Improvement in Wireless MANETS

A mobile ad hoc network is a self-created, self-organized and self-administering set of nodes connected via wireless links without the aid of any fixed infrastructure or administrator. Protecting the network layer from malicious attacks is an important and challenging issue in both wired and wireless networks and the issue becomes even more challenging in the case of wireless mobile ad hoc network. In this paper we propose a solution of triple umpiring system (TUS) that provides security for routing and data forwarding operations. In our system each nodeʹs behaviour from source to destination is closely monitored by a set of three umpires. If any misbehavior is noticed umpires flag off the guilty node from the circuit. We have proposed two enhancements to the basic TUS for salvaging, the circuit during disruptions in route reply and data forwarding phases. The model with these two enhancements is called ETUS. We have implemented TUS and ETUS by modifying the popular AODV protocol. Extensive simulation studies using QualNet 5.0 establish the soundness of the proposal.