Proposal of a method to detect black hole attack in MANET

Black hole attack is a serious threat in a mobile ad hoc network (MANET). In this attack, a malicious node injects a faked Route Reply message to deceive the source node so that the source node establishes a route to the malicious node and sends all the data packets to the malicious node. Every conventional method to detect such an attack has a defect of rather high rate of misjudgment in the detection. In order to overcome this defect, we propose a new detection method based on checking the sequence number in the Route Reply message by making use of a new message originated by the destination node and also by monitoring the messages relayed by the intermediate nodes in the route. Computer simulation results demonstrate that our method has a feature of much lower false positive and negative rates in detecting any number of malicious nodes than the conventional methods.