Improved Trust System for Clustered Wireless Sensor Network
In wireless sensor network the resource efficiency and reliability of a trust system are the most basic supplies. Due to the low reliability and high overhead the developed existing trust systems for wireless sensor networks are unable of satisfying these supplies. Therefore there is need to propose a lightweight and reliable trust system which can efficiently decrease the networking consumption while malicious, selfish and faulty cluster heads and also exceeds the limitations of traditional weighting methods for trust factors in which weights are allocated subjectively and also insist less communication overhead and memory. In this work, Improved Trust System (ITS) is proposed for clustered WSNs. In the ITS protocol, the trust system defines the tasks of the nodes as sensing, aggregating and routing, and evaluating the trustworthiness of each task based on first-hand and second-hand information. Here the trust metrics such as energy, link availability, along with Per-hop Packet Pair Delay are used. The residual energy, link availability between nodes and Per-hop Packet Pair Delay ie., calculation of the time required to reach the destination and to receive the acknowledgement of receipt sent by the sending node must be taken into consideration and combined with the reputation and trust system to keep the network secure, reliable, and energy-efficient. Theory as well as simulation results show that ITS demands less memory and communication overhead as compared with other typical trust systems and is more suitable for clustered WSNs.