Internet of Things Access Control System Based on Smart Contract

The rising of digital economy is due to the rapidly development of the new generation of information technology, represented by Internet of Things (IoT) technology. However, the huge number of sensors have limited resources and lack robust security mechanism, which brings a great risk challenges for centralized access control system. In order to deal with these challenges, the paper proposes a novel Capability-Based Access Control Model (NCBAC), which makes use of the advantages of Capability-Based Access Control (CBAC) decision-making mechanism and introduces role sets and attribute set for smart contract. This model is built for providing a decentralized, flexible, expandable and high-granularity access control system. Additionally, token has been conducted in access control model for enhancing the system's capability. Finally, the simulation experiment results showed the feasibility and effectiveness of the system, which also demonstrates the token mechanism promoting the access control performance of the system effectively.