|Project Description: ||Many packets of data have been lost during transfer; there are two major sources for packet loss in a multi-hop wireless ad hoc network---link errors and malicious packet drops. This research paper focuses on determining the cause of these losses. By observing the sequence of packet drops in the multi-hop wireless ad hoc network, it would be easy to detect whether the data loss is due to the combined effect of malicious packet dropping and link errors or solely due to link errors. Insider attacks occur when the malicious nodes that are a part of the routing system take advantage of the cooperative nature of the network to launch an attack. Once these malicious nodes are incorporated into the route, the saboteur selectively drops small amounts of packets critical to the performance of the ad hoc network.
For this study, public auditing architecture was developed that allows the detector to verify the authenticity of the packet loss information being reported by the nodes. A packet-block-based mechanism is also proposed, which would lessen the computational overhead of the baseline scheme. This would further allow one to trade detection correctness for the reduced complexity of the computation. Finally, extensive simulations have verified that the proposed mechanisms can detect malicious packet dropping more accurately than the conventional methods, such as maximum-likelihood-based detection.