Trust level based Byzantine attack-exclusion cooperative spectrum sensing scheme for Wireless Cognitive Sensor Networks in smart grids

摘要

To deal with the challenges of Wireless Sensor Networks (WSN) in the smart grid, such as heterogeneous coexistence, spectrum scarcity, tremendous data processing and Security guarantees, revolutionary communication architecture is urgently demanded, a revolutionary communication paradigm termed as Wireless Cognitive Sensor Network (WCSN) whose basic idea is to incorporate cognitive radio capability in wireless sensor network is introduced. In this paper, we investigate how to defense against the new type of attack in the WCSN of smart grids: Byzantine attack, where the malicious secondary user sends false reporting values to the control center inducing the control center to make wrong decisions on spectrum allocation and power dispatching. Specifically, we develop a Byzantine attack detection algorithm that calculates the trust level of each wireless cognitive sensor in the smart grid based on their past reporting values. Once the trust value and consistency value for each secondary user are calculated by the control center, the reporting values will be excluded in decision-making if these two values are blow certain thresholds. Simulation results verify that even a single malicious user can significantly degrade the performance of collaborative sensing and our scheme can effectively distinguish malicious secondary users from legitimate ones compared with existing defense methods (i.e. OR rule). The Receiver Operating Characteristic (ROC) curves for the Byzantine attack detection demonstrate the improvement on the security of collaborative spectrum sensing in the WCSN of the smart grid.