A New Approach for Detecting and Eliminating Cooperative Black hole Nodes in MANET

Mobile Ad hoc Network (MANET) is a kind of Ad hoc network with mobile nodes. Special features like hop-by-hop communications and dynamic topology made routing protocols vulnerable against a variety of attacks. Black hole attack is one of the widely used attacks against routing protocols. In this attack, malicious nodes inject fault routing information to the network and lead all data packets toward them-selves, then drop them all. In this paper, a new mechanism is presented for detecting and eliminating cooperative malicious nodes in MANET based on Ad hoc On Demand Distance Vector (AODV) routing protocol. In our approach source node checks both Next_Hop_Nodes (NHN) and Pervious_Hop_Nodes (PHN) of Route Reply generator in order to check the safety of path. By using a Data Routing Information (DRI) table all malicious nodes eliminated from the network. Simulation results show that our approach decreased the processing time and packet overhead in compare with another work. In addition, our approach detects all malicious nodes in a path in each run with no false positive detection.