A Blockchain-Based Trust Management Mechanism for IoT

The increasing use of connected objects in Internet of Things systems leads to the production of a large amount of data, which creates many challenges and security issues and prevents the widespread use of Internet of Things. Trust management is a well-known solution to improve security in the Internet of Things, in which malicious attacks are detected by evaluating user behavior and calculating the level of trust in them. Traditional methods of distributed trust management do not meet the scalability requirements and resource limitations of IoT devices. Blockchain is used to solve the challenges of trust management in the Internet of Things due to its lack of centralization and immutability. In this article, a blockchain-based trust management method is presented, in which each object evaluates the level of trust of the service providers it has interacted with using the service quality criterion and publishes it in the blockchain. In this method, the nodes are leveled based on the level of trust and after analyzing the behavior, they are punished and rewarded. The evaluation of the proposed method show that the proposed method has a good performance in detecting malicious nodes and dealing with bad-mouthing, self-promotion, On-Off and voting attacks.