With the advancement in networking technologies and emerging applications that work on different protocols, the basic usage of networks, i.e., transferring by packets and global connectivity has to be maintained. The Delay Tolerant Networks (DTNs) are characterized by high end-to-end latency, frequent disconnection, and opportunistic communication over unreliable wireless links. In this paper, we designed a dynamic trust management protocol for secure routing optimization in Delay Tolerant Network(DTN) environments in the presence of well-behaved, selfish and malicious nodes. We develop a novel model-based methodology for delay tolerant networks for extreme distances and trust based techniques to ensure secure routing. © 2018 IEEE.