Mobile Ad-hoc Network is a network in which mobile nodes communicate with each other by the help of wireless links and mobile nodes can move randomly in a network without any centralized management system. As MANET is a wireless network, security is a major concern and different type of attacks can manipulate the data/info that are transmitted from the source node to destination node in the network. This paper presentsthe literature review of DSR routing protocol and previously proposed approaches that plays a major role for enhancing the performance of DSR routing protocol. The paper introduces a hashing technique that will enhance the security of DSR routing protocol in mobile ad-hoc network.