Data Sharing System Integrating Access Control Based on Smart Contracts for IoT.

Development of Internet of Things (IoT) network brings new concept of Internet. The dramatic growth of IoT increased its usage. IoT network facilitates in several manners, more specifically, in access control and data sharing among IoT devices. However, it has many challenges, such as: security risks, data protection and privacy, single point of failure through centralization, trust and data integrity issues, etc. This work presented a blockchain based access control and sharing system. The main aim of this work is to overcome the issues in access control and sharing system in IoT network and to achieve authentication and trustworthiness. Blockchain technology is integrated with IoT, which simplifies the access control and sharing. Multiple smart contracts: Access Control Contract (ACC), Register Contract (RC), Judge Contract (JC), are used that provide efficient access management. Furthermore, misbehaviour judging method utilizes with penalty mechanism. Additionally, permission levels are set for sharing resources between users. Simulation results show the cost consumption. Bar graphs illustrate the transaction and execution cost of smart contracts and functions of main contract.