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1、AbstractWiththerapiddevelopmentofnetworktechnologyanddataexpansion,theadvantagesofcloudstoragebecomemoredistinct,suchaslowcost,easymanagement,expansionasrequiredandsoon,whichwillenablecloudstoragetobetheleadingstoragepatterninthefuture.However,theapplicationrangeofcloudstorageservicesisstil
2、llimitedatpresent,sincethekeyproblemisthesecurityofuserdataonthecloud.Thedatasecuritypoliciesoncloudstoragegatewaypreventsdataleakageonthecloud,whichaffordsuserstogetthestatusofclouddatainrealtime,sothattheycanemployscloudstorageservicesthroughcloudstoragegatewaywithoutanyworries.Comparedwi
3、ththeexistingprovabledatapossessionschemes,theprovabledatapossessionmoduleconsumeslesscomputationaloverheadandsupportsunlimitedtimesofdataverification.Becausetheprovabledatapossessionmoduleisinvisibletocloudstorageproviders,theverificationresultsoftheprovabledatapossessionmodulecannotbeforg
4、ed,sothismodulechoosestheefficienthashalgorithmtoverifydataonthecloud,thusavoidingthehighcomputationalcostofusingpublickeycryptographytechnologysolutions.Theverificationfunctionisimplementedbyprobabilisticsamplingmethod,sotheresponsetimehasnothingtodowiththefilesize.Thismodulesupportsperiod
5、ictasksthatsetbyuser,allowinguserstodiscoverthedamageofclouddataintimeandreducingthelosscausedbythedamageofclouddata.TheencryptionmoduleimplementedtheencryptionanddecryptionfunctionautomaticallybyrewritingtheinterfacesofFilesysteminUserspace.Inordertoreducetheresponsetimeofuseroperationsand
6、increasetheefficiencyoftheencryptionmodule,theencryptionmoduleimplementedencryptionanddecryptionofdatawithasynchronousmulti-threaded.Theexperimentalresultsshowthattheprovabledatapossessionmoduleconsumeslesscomputationaloverheadandsupportunlimitedtimesofdataverification;theencryptionmoduleis
7、high-efficiencywithoutadditionaloperation;thedatasecuritypolicycauseslittleimpactontheoverallperformanceofcloudstoragegateway.Keywords:Cloudsecurity,Cloudstoragegateway,ProvableDataPossession,FilesysteminUserspace摘要IAbstractII1绪论1.1课题背景(1)1.2国内外研究现状(2)1.
