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In view of these problems, a blockchain-based electronic medical record access control research scheme based on the role-based access control model is proposed in this article. First, the appropriate access control strategy is adopted to solve the leakage problem of the user\u2019s medical privacy information during the access process. Then, the information entropy technology is used to quantify the medical data, so that the medical data can be effectively and maximally utilized. Using the distributed general ledger characteristics of blockchain and its inherent security attributes, data islands can be eliminated, data sharing among medical systems can be promoted, access records can be prevented from being tampered with, and medical research and precise medical treatment can be better supported. Through this research, not only can user\u2019s medical privacy information protection be realized during the service process but also patients can manage their own medical data autonomously, which is beneficial to privacy protection under the medical data sharing. <\/jats:p>","DOI":"10.1177\/1550147719889330","type":"journal-article","created":{"date-parts":[[2019,11,19]],"date-time":"2019-11-19T06:30:22Z","timestamp":1574145022000},"page":"155014771988933","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":27,"title":["Research on electronic medical record access control based on blockchain"],"prefix":"10.1177","volume":"15","author":[{"given":"Yongbin","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Information Science and Technology, Shijiazhuang Tiedao University, Shijiazhuang, 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