云医疗环境下策略可更新的多权威属性基安全方案

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Multi-authority attribute-based security solution for policy renewability in cloud healthcare environments

Wu Zhaoxia，Jiang Xu† （FacultyofStatistics & Data Science，Xinjiang UniversityofFinance& Economics，Urimqi83oo12，China）

Abstract：Inthecloud medicalenvironment，medicaldata stored inthecloud has problems likeeasy privacyleakageand high cost of acesspolicyupdates.Toaddresstheseproblems，this paper proposedamulti-authorityatribute-basedsecurityscheme withupdatablepolicies.Theproposedschemewasbasedonmultipleauthoritativeinstitutionssuchashospitalsandresearch institutes，hich manageddisjointatributests.Itencrypteddatausingaciphertext-olicyatribute-basedencryptionapproach， enabling fine-grainedaccessandsecuresharingof medicaldatainthecloud.Theschemeintroduced policyupdate keystofficientlyupdate access policies withlowoverhead.Securityanalysisand experimental resultsshowthatthe scheme has ciphertext indistinguishabilitysecurityandanti-conspiracyatacksecurity，ndhaslowtimeoverheadinencryption，decryptionandpolicy update，effectivelyrealizing the secure storage of medical data in thecloud and dynamic policy update.

Key Words：attribute-based encryption；access control；multi-authority；policy update

0 引言

随着云存储技术的飞速发展，许多医疗机构选择将医疗数据上传到云存储平台，进行远程访问、共享或更新数据。（剩余13066字）