Trust-driven Distributed Self-collaborative Security Architecture of IoT Based on Blockchain and Smart Contracts

As Internet of Things (IoT) technology is growing fast, it is clearly forseen that the number of IoT devices and the scale of connections will be further expanded. IoT is capable of taking advantage of the existing network infrastructure effectively, so as to achieve data sharing between devices. However, the large scale and complexity of the network structure will bring potential security risks to IoT system. The traditional access control model is more complex and centralized. This paper aims to build a trust-driven distributed self-collaborative security architecture of IoT based on blockchain and smart contracts, which could overcome the single-point failure problem of centralized entities. Implementation of the security architecture shows that it still possesses characteristics including scalability, lightweight, and fine granularity, while the secure access control preserves the privacy of IoT devices.