An ad hoc wireless network is a temporary and dynamic environment where a group of mobile nodes with radio frequency transceivers communicate with each other without the intervention of any centralized administration or established infrastructure. Due to the limited transmission range of each mobile node, communication sessions between two nodes are usually established through a number of intermediate nodes, which are supposed to be willing to cooperate while forwarding the messages they receive to their destination. Unfortunately, some of these intermediate nodes might not be trustworthy and might be malicious, thereby forming a threat to the security and/or confidentiality of the exchanged data between the mobile nodes. This paper proposed a partially distributed dynamic model for security against such misbehaving nodes and ensured secure routing in mobile ad hoc networks and it also proposes to make network time delay efficient. The proposed scheme is partially distributed in the sense that supplementary information is propagated amongst nodes implicitly during route establishment rather than the flooding of explicit packets. This supplementary information (in the form of GMC) is used as a cautionary measure against misbehaviour of a node rather than directly considering the accused node as “misbehaving”. Co-operation is induced first, using a dynamic time-out based mechanism that threatens misbehaving nodes by blocking all communications with them in accordance to the severity of their misbehaviour. The timer for which a node is blocked depends upon past communication with that node and the frequency of its misbehaviour locally, i.e., LMC and globally, i.e., GMC. Different weights are assigned to both LMC and GMC for efficacy of system performance. Secondly, a dynamic credit allotment mechanism that reciprocates a node’s behaviour by allotting Chips to it is employed. It precisely examines the overall behavior of a node in the network by considering not only its forwarding behaviour with the host node but also supplementary information received regarding its behaviour from other nodes. It was also concluded that if we use least spaning tree for the MANET then the time efficiency has been increased.
