Trust-based Framework for Security Enhancement of Wireless Sensor Networks

In this paper we demonstrate how the concept of trust can be used to increase security in wireless sensor networks. Since because of limited resources the traditional approach to security based on cryptography is not always can be utilized in secure sensor networks, we consider the way of protecting such networks by taking into consideration trustworthiness of individual sensors. We show how trustworthiness of sensors can be calculated and maintained dynamically based on monitoring sensors´ activities. In proposed approach we use the subjective logic as the trust metric. We argue that when there are requirements to trustworthiness of gathered data from sensors the security can be improved even without using cryptography.