A security system design with dynamic channel hopping method for wireless sensor network

Wireless Sensor Networks (WSNs) are of high interest both in research studies and in industrial applications since they can work for a long time without additional maintenance. The nodes building a WSN, which are typically supplied by standard batteries, are in fact integrated circuits communicating relatively in a short distance and have a very limited data processing/storing capacity. As they communicate in wireless medium and generally located outside, they are prone to high risk of attacking scenarios.The jamming attacks, emitting radio signals continuously to the wireless medium in order to disturb an ongoing communication, corrupting packets or keeping the channel busy all the time, are one of the most destructive threats for WSNs. Not only can they cause the nodes to be out of service but also shorten their operational working cycles. The WSNs must have robust and adaptive counter measures against such potential threats especially in military and medical applications in which system faults cannot be tolerated in any case.In this thesis, in order to detect jamming attacks, an anomaly based jamming detection mechanism (AJDM) has been designed. Since the AJDM itself cannot guarantee a healthy operation mode of wireless communication, a dynamic channel hopping (DCH) method has also been designed to preserve the proper networking conditions. According to the simulation results, the well-known attacking scenarios can be detected by the AJDM by maintaining high detection rates along with low false positive rates. Additionally, the nodes continue normal mode of operation by using the DCH when a jamming attack is launched by an adversary node.