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1、ResearchArticleInternationalJournalofDistributedSensorNetworks2017,Vol.13(8)Efficientdatapossession–checkingÓTheAuthor(s)2017DOI:10.1177/1550147717727461protocolwithdeduplicationincloudjournals.sagepub.com/home/ijdsn1,21,21,21,23JinxiaWei,XinxinNiu,RuZhang,JianyiLiuandYuangangYaoAbstractDedupli
2、cationhasbeenwidelyappliedtosavestorageoverheadinthecloudserver.Dataintegrityverificationwithdedu-plicationcannotonlysavespaceofthecloudserverbutalsoensuresecurityofthestoreddata.Intheexistingintegrityverificationscheme,deduplicationsareimplementedbythecloudserver.Thesignaturesofalldatablocksar
3、egeneratedandsenttothecloudserver.Oncereceivingthedatablocksandsignatures,thecloudservercomparesthereceivedsig-natureswiththestoredsignatures.Ifthereisasignaturethathasthesamevalueassomestoredsignature,thereceivedsignatureanddatablockwillnotbestoredbythecloudserver.Otherwise,thecloudserverstore
4、sallreceivedsignaturesanddatablocks.Infact,theseoperationsbringalotofcomputationalcosts.Tosolvethisproblem,weproposeadataintegrityverificationschemewithdeduplication.Inthisscheme,thededuplicationisperformedbythecloudusers,whichcanavoidadditionalcommunicationalandcomputationalcosts.Theexperiment
5、evaluationindicatesthatourschemeispracticalforrealapplicationscenario.Wedemonstratethattheproposedschemesatisfiessignatureunforgeability,andthemalicioususerscannotobtainanylegitimatefilefromthecloudserverintheformofdeception.KeywordsDataintegrityverification,dynamicdeduplication,publicchecking,
6、homomorphiccomposability,homomorphicverifiabilityDatereceived:18September2016;accepted:24July2017AcademicEditor:LucaFoschiniIntroductionremotedatablocksthatarestoredonthecloudserver.TheusersdividetheirfilesintomultipledatablocksCloudserviceplatformisbecomingmoreandmoreandstoretheseblocksonthecl
7、oudserver.Periodically,popularbecauseitisregardedasapromisingtechniquethecloudusersinitiateintegrityverificationchallenges.torelieveburdenofthecloudusers’localhardwareandThen,thecloudservermakesresponsesforthechal-1softwaremainten