Abstract: Delay Tolerant Network (DTN) is a class of network which has high end to end latency, opportunistic communication and infrastructure less network. The selfish or malicious node may drops the received packet, due to such type of misbehavior the performance of network decreases. In this paper, the survey of security trends in Delay Tolerant Networks is reviewed. The various ways for dropped packet detection and routing misbehavior detection with an appropriate method are presented. It also focuses method for defending against flood attacks in DTNs, secure data retrieval scheme, design and validation of dynamic trust management protocol. The remark is also made with the overall analysis.

Keywords: DTN, Security, Trusted Authority, Misbehavior Detection, Trusted Authority.