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Sun, Shuang, Chen, Shudong, Du, Rong, Li, Weiwei, Qi, Donglin.  2019.  Blockchain Based Fine-Grained and Scalable Access Control for IoT Security and Privacy. 2019 IEEE Fourth International Conference on Data Science in Cyberspace (DSC). :598–603.
In this paper, we focuses on an access control issue in the Internet of Things (IoT). Generally, we firstly propose a decentralized IoT system based on blockchain. Then we establish a secure fine-grained access control strategies for users, devices, data, and implement the strategies with smart contract. To trigger the smart contract, we design different transactions. Finally, we use the multi-index table struct for the access right's establishment, and store the access right into Key-Value database to improve the scalability of the decentralized IoT system. In addition, to improve the security of the system we also store the access records on the blockchain and database.