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Abstract
Mobile ad hoc networks (MANETs) are a dynamic network in which the mobile node does not have any infrastructure. Link breakages exist due to its high mobility of nodes which leads to frequent path failures and route discoveries. The neighbor coverage and probabilistic mechanism significantly decreases the number of retransmissions so as to reduce the routing overhead. Since security is also a challenging factor in adhoc networks a concept of secured efficient routing is included with NCPR which enables a new trust approach based on the extent of friendship between the nodes is proposed which makes the nodes to co-operate and prevent flooding attacks in an ad hoc environment. All the nodes in an ad hoc network are categorized as friends, acquaintances or strangers based on their relationships with their neighboring nodes. During network initiation all nodes will be strangers to each other. A trust estimator is used in each node to evaluate the trust level of its neighboring nodes. This approach combines the advantages of the neighbor coverage knowledge and the probabilistic mechanism, which can significantly decrease the number of retransmissions so as to reduce the routing overhead, and improve the security. Specifically, throughput and packet delivery ratio can be improved significantly.