In Trust based Networks, nodes are typically being controlled by realistic entities such as people. Trust based Network is aiming at enabling communication through highly heterogeneous networks by relying on dynamic nature of message transmission whenever there is arise in communication opportunities, such communication thus does not rely on a routing infrastructure and is peer-to-peer in nature. The delay-tolerant paradigm is akin to trust based networks, thus a suitable approach to address the lack of connectivity and the mobility. In this thesis we simulate attack and are monitoring the nodes by Particle swarm optimization, thus preventing the attack and which will lead to through put increase and overhead reduce.