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This paper proposes an IoT data access control scheme that combines attribute-based encryption (ABE) and blockchain technology. Symmetric encryption and ABE algorithms are utilized to realize fine-grained access control and ensure the security and openness of IoT data. Moreover, blockchain technology is combined with distributed storage to solve the storage bottleneck of blockchain systems. Only the hash values of the data, the hash values of the ciphertext location, the access control policy, and other important information are stored on the blockchain. In this scheme, smart contract is used to implement access control. The results of experiments demonstrate that the proposed scheme can effectively protect the security and privacy of IoT data and realize the secure sharing of data.<\/jats:p>","DOI":"10.1155\/2021\/5308206","type":"journal-article","created":{"date-parts":[[2021,9,16]],"date-time":"2021-09-16T21:50:20Z","timestamp":1631829020000},"page":"1-13","source":"Crossref","is-referenced-by-count":23,"title":["A Fine-Grained IoT Data Access Control Scheme Combining Attribute-Based Encryption and Blockchain"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1033-164X","authenticated-orcid":true,"given":"Xiaofeng","family":"Lu","sequence":"first","affiliation":[{"name":"Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3136-3747","authenticated-orcid":true,"given":"Songbing","family":"Fu","sequence":"additional","affiliation":[{"name":"Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2064-3754","authenticated-orcid":true,"given":"Cheng","family":"Jiang","sequence":"additional","affiliation":[{"name":"Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0540-5053","authenticated-orcid":true,"given":"Pietro","family":"Lio","sequence":"additional","affiliation":[{"name":"Computer Laboratory, University of Cambridge, Cambridge, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1109\/issi.2018.8538281"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1109\/mcom.2017.1600363cm"},{"key":"3","doi-asserted-by":"publisher","DOI":"10.1109\/hpca.2016.7446082"},{"key":"4","doi-asserted-by":"publisher","DOI":"10.3390\/s18082449"},{"key":"5","doi-asserted-by":"publisher","DOI":"10.1109\/tii.2020.2966069"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.1109\/access.2016.2566339"},{"key":"7","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpdc.2020.03.005"},{"key":"8","doi-asserted-by":"publisher","DOI":"10.1007\/s10916-018-0997-3"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1016\/j.ins.2020.10.058"},{"key":"10","doi-asserted-by":"publisher","DOI":"10.1016\/j.future.2018.05.062"},{"key":"11","article-title":"Fuzzy identity-based encryption","author":"A. 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