A survey on Blockchain based access control for Internet of Things

Access control models for the Internet of Things (IoT) proposed in the literature are based on centralized architecture and raise security issues due to the spontaneous and dynamic interaction between IoT devices. In addition to the scalability and lightweight features, the need of secure and distributed access control architecture to overcome the single point failure problem of a centralized entity becomes a big challenge. This can be done through the Blockchain technology which is used recently to provide access control services. Exploiting this technology to manage access IoT devices in term of distribution, heterogeneity, scalability, fault tolerance capability, security and privacy are promising. In this paper, a comprehensive review of the existing access control models based on Blockchain is presented and discussed with comparison and analysis.