DTN is a network in which no direct contacts are present between network nodes. For data packet transmission in network, concept of intermediate nodes is used. Data transmission through intermediate nodes is not secure because unfortunately some intermediate nodes behave as malicious nodes. So security in DTN is a challenging task. Different types of malicious nodes perform different kind of attacks during data transmission. In this paper, present a grade based scheme to detect malicious nodes and distinguish them from normal nodes based on their behavior. Proposed scheme is implemented with the help of ONE (Opportunistic Network Environment) simulator. Keywords: DTN (Delay Tolerance Network), ONE (Opportunistic Network Environment), MN (Malicious Node), TN (Trusted Node), GradeCite this Article Divya Bansal, Ajay Jangra. A Grade Based Scheme to Detect Malicious Nodes in Delay Tolerant Networks. Journal of Network Security. 2015; 3(3): 17–21p.
