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1、2ndIEEEInternationalConferenceonCloudComputingTechnologyandScienceFine-grainedDataAccessControlSystemswithUserAccountabilityinCloudComputingJinLi1,GansenZhao2;5,XiaofengChen3,DongqingXie1ChunmingRong4,WenjunLi5,LianzhangTang1,YongTang21SchoolofComputerScienceandEducationalSoftwareGuangzhouUniv
2、ersity,China2SchoolofComputerScience,SouthChinaNormalUniversity,China3KeyLaboratoryofComputerNetworksandInformationSecurityXidianUniversity,China4Dept.ofElectricalEngineeringandComputerScienceStavengerUniversity,Norway5SchoolofSoftware,SunYat-senUniversity,ChinaAbstractCloudcomputingisanemergi
3、ngcomputingbyresource-constrainedusersthroughbeingdelegatedtoparadigminwhichITresourcesandcapacitiesareprovidedresource-abundantcloudservers.AscomparedtosettingupasservicesovertheInternet.Promisingasitis,thisparadigmtheirowninfrastructures,clouduserscantremendouslysavealsobringsforthnewchallen
4、gesfordatasecurityandaccesstheircapitalexpendituresviatheusageofcloudcomputing,controlwhenusersoutsourcesensitivedataforsharingoncloudservers,whicharelikelyoutsideofthesametrustdomainofnottomentionotherbenefitssuchasreliabilityandhighdataowners.Tomaintaintheconfidentialityofsensitiveuserscalabil
5、ityofthesystem.Withtheemergenceofcommercialdataagainstuntrustedservers,existingworkusuallyapplycloudcomputingplatformssuchasAmazon’sEC2andS3cryptographicmethodsbydisclosingdatadecryptionkeysonlyto[1],GoogleAppEngine[2],andMicrosoftAzure[3],cloudauthorizedusers.However,indoingso,thesesolutionsi
6、nevitablycomputinghasbeenmorearealitythanjustaconcept.introduceheavycomputationoverheadonthedataownerforkeydistributionanddatamanagementwhenfine-graineddataAsinanyexistingapplicationandsystem,securityandaccesscontrolisdesired,andthusdonotscalewell.privacyplayanextremelyimportantroleforthesucces
7、sofInthispaper,wepresentawaytoimplementscalableandcloudcomputing,andcertainlyraisenewchallengesamongfine-grainedaccesscontrolsystemsbasedonattribute-basedthemanyothersthatcloudcomputingisconfrontedwith.encryption(ABE).Forthepurposeofsecu
