云醫(yī)療環(huán)境下策略可更新的多權(quán)威屬性基安全方案

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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

隨著云存儲技術(shù)的飛速發(fā)展，許多醫(yī)療機(jī)構(gòu)選擇將醫(yī)療數(shù)據(jù)上傳到云存儲平臺，進(jìn)行遠(yuǎn)程訪問、共享或更新數(shù)據(jù)。（剩余13066字）