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A Distributed Trust Model Based on Hoeffding’s Inequality for Wireless Sensor Networks
Farimah Zarrabi Kia and Hassan Shakeri
Nowadays wireless sensor networks (WSNs) are the predominant choice for remote monitoring in various domains including industry, military, medicine, scientific research etc. In most applications of wireless sensor networks nodes operate in unattended environments, therefore they are vulnerable to many attacks. Due to the dynamic changes and unpredictable behavior of nodes, obtaining reliable data is tricky. Traditional encryption and authentication solutions are not useful to detect malicious nodes In wireless sensor networks. Recently, trust-based solutions have been more effective in addressing malicious nodes. In this paper an approach for computing distributed trust in wireless sensor network based on Hoeffding’s Inequality is presented. In the proposed scheme, the calculation of trust in each node contains a combination of direct trust, assigning proper frequency based on Hoeffding’s inequality, and calculation of indirect trust. Finally, to evaluate the proposed method, two criteria of accuracy of indirect trust and detection rate of malicious nodes are measured. According to the results, both criteria are improved compared to the well-known existing model of EDTM.
Keywords: Wireless sensor networks, Trust, Distributed trust model, Hoeffding’s Inequality