External Node Intrusion Detection Scheme Based on Node Trust Value of WSNs in AMI of Smart Grid

In order to ensure the safe and stable operation of smart grid, the intrusion detection scheme based on node trust value is proposed for external node attacks of wireless sensor networks (WSNs) in Advanced Metering Infrastructure (AMI). The scheme applies the positive-abnormal statistics of communication messages to calculate the trust value. In this paper, the node trust value calculation method is improved and the trust value is used to judge whether the node is invaded. The simulation results show that the scheme can effectively detect external node intrusion, and has higher detection rate and lower false detection rate.