Abstract
The Internet of Things (IoT) is widely affecting our daily lives in many different activities and applications. IoT devices are ranging from a tiny wearable device to large industrial applications. Wide variety of IoT applications have been developed and deployed involving many devices and produced huge data. In IoT applications, privacy, security, and trust play an important role in the success of IoT implementation. Trust can be defined as a key property to establish trustworthy and connectivity among devices to ensure secure services and applications. This paper addresses a survey of trust calculation models for IoT systems, i.e., what are available models or methods used by researcher to compute trust in IoT system. In addition, classification is also developed to categorize trust calculation model using five parameters including trust metric, trust source, trust algorithm, trust architecture, and trust propagation. Furthermore, some research challenges and directions are identified within the topic of trust-based security in IoT.
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