A Secure Clustering Protocol With Fuzzy Trust Evaluation and Outlier Detection for Industrial Wireless Sensor Networks
Liu Yang, Yinzhi Lu, Simon X. Yang, Tan Guo, Zhifang Liang
Abstract
Security is one of the major concerns in industrial wireless sensor networks (IWSNs). To assure the security in clustered IWSNs, this article presents a secure clustering protocol with fuzzy trust evaluation and outlier detection. First, to deal with the transmission uncertainty in an open wireless medium, an interval type-2 fuzzy logic controller is adopted to estimate the trusts. And then, a density-based outlier detection mechanism is introduced to acquire an adaptive trust threshold used to isolate the malicious nodes from being cluster heads. Finally, a fuzzy-based cluster heads election method is proposed to achieve a balance between energy saving and security assurance, so that a normal sensor node with more residual energy or less confidence on other nodes has higher probability to be the cluster head. Extensive experiments verify that our secure clustering protocol can effectively defend the network against attacks from internal malicious or compromised nodes.