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Problem statement: A Mobile Ad Hoc Network (MANET) is a self-created self-organized and self-administering set of nodes connected via wireless links without the aid of any fixed infrastructure or centralized 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 MANET. Approach: In this study we propose an Umpiring System (US) that provides security for routing and data forwarding operations. We present three US models- Single (one) Umpiring System (SUS), Double Umpiring System (DUS) and Triple Umpiring System (TUS). In the umpiring system, each paricipating node of the system will have different roles to play; some of the nodes will be doing traditional operations of routing and packet forwarding, while some others will be monitoring the behaviour of designated nodes. If any misbehavior is noticed umpires immediately flag off the guildy node. Results: We find that. Throughput with single umpire system is greater than DUS and TUS. From throughput and energy point of view SUS is the best. But both false positives and false negatives are lower with TUS, indicating it is a better detection system. Conclusion: We envisage that our system can profitably be used in civilian situations where invariably nodes are lean and energy starved

System of One to Three Umpire Security System for Wireless Mobile Ad hoc Network