A Robust Clock Synchronization Scheme for Wireless Sensor Networks against DoS Attacks

This paper investigates the clock synchronization problem of wireless sensor networks with time-varying noises and malicious denial of service (DoS) attacks. A robust and secure clock synchronization scheme based on filter is proposed in intermittent DoS attack case, which is composed of three steps: relative skew estimation, clock skew compensation and software clock reading compensation. Through the clock skew compensation, the synchronization error of the clock skew can be constrained into a bounded range. Through the software clock reading compensation, the possible error of the software clock reading can be compensated and the clock synchronization can be achieved completely. In addition, extensive simulations are conducted which validate that the proposed scheme outperforms the existing ones.