Abstract: The objective of this paper is to focus on security issues related to Mobile adhoc networks. Packet dropping and modifying is a common attack in wireless networks. These attacks interrupt the communication network and are difficult to identify in multi hop networks. The results present an effective scheme to identify the packet droppers and modifiers by using ranking algorithms on the DAG generated by the nodes in the network. Simulation results are presented.

Keywords: DAG, Packet Droppers, Packet Modifiers, Security, Ranking Algorithms, MANET.