Abstract:
A mobile ad-hoc network (MANET) is an autonomous wireless system which consists of several mobile nodes to form an arbitrary and temporary network. As the lack of infrastructure network, MANETs are facing various severe security attacks. Black hole is one of these attacks and it announces the best path to the destination and discards all data packets to it. In this paper, a defense mechanism is presented against black hole attack. The proposed system adds two new tables to Ad Hoc On-Demand Distance Vector (AODV) routing protocol. One is Route Reply (RREP) Record Table (RRT) to store RREP from neighbor’s nodes. Another is Node Information Table (NIT) to mark the malicious nodes and the successful connection of the neighbor nodes. This method removes black hole node and chooses a reliable node by using these two tables. When the black hole node is detected, the system is automatically sending out the Alarm message to all neighboring nodes.
