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Research of Various Techniques for Evaluating Nodal Trust in Hierarchical WSN

In today’s modern world the wireless sensor networks have become a crucial tool to serve various purposes. The applications falling in range of wireless sensor networks are vast and tend to conquer our everyday life. It was initially designed for surveillance and monitoring for defense related operations but then it also proved to be boon for the health, traffic, consumer and industrial areas. Also, it is one of the most popular technologies for smart cities. However, the wireless sensor networks are highly prone to security attacks, and due to the dynamic, collective and collaborative behavior of sensor networks a secure data transfer has become a challenging task. The deployed sensor nodes, especially in the multi hop environment can get compromised and can behave maliciously. Therefore it becomes necessary to assess the trust worthiness or reliance of the sensor node over the other present in the network. Several researches have investigated various techniques for determining the nodal trust in WSN. This paper discusses the major challenges in wireless sensor network, potential attacks occurring due to compromised nodes along with the different types of trust models. It also figures out some of the existing trust models which are used in evaluating nodal trust in wireless sensor networks.`