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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,JianyiLiuandYuangangYao
2、AbstractDeduplicationhasbeenwidelyappliedtosavestorageoverheadinthecloudserver.Dataintegrityverificationwithdedu-plicationcannotonlysavespaceofthecloudserverbutalsoensuresecurityofthestoreddata.Intheexistingintegrityverificationscheme,deduplicationsareimplementedbythecloudserver.
3、Thesignaturesofalldatablocksaregeneratedandsenttothecloudserver.Oncereceivingthedatablocksandsignatures,thecloudservercomparesthereceivedsig-natureswiththestoredsignatures.Ifthereisasignaturethathasthesamevalueassomestoredsignature,thereceivedsignatureanddatablockwillnotbestoredb
4、ythecloudserver.Otherwise,thecloudserverstoresallreceivedsignaturesanddatablocks.Infact,theseoperationsbringalotofcomputationalcosts.Tosolvethisproblem,weproposeadataintegrityverificationschemewithdeduplication.Inthisscheme,thededuplicationisperformedbythecloudusers,whichcanavoid
5、additionalcommunicationalandcomputationalcosts.Theexperimentevaluationindicatesthatourschemeispracticalforrealapplicationscenario.Wedemonstratethattheproposedschemesatisfiessignatureunforgeability,andthemalicioususerscannotobtainanylegitimatefilefromthecloudserverintheformofdecep
6、tion.KeywordsDataintegrityverification,dynamicdeduplication,publicchecking,homomorphiccomposability,homomorphicverifiabilityDatereceived:18September2016;accepted:24July2017AcademicEditor:LucaFoschiniIntroductionremotedatablocksthatarestoredonthecloudserver.Theusersdividetheirfile
7、sintomultipledatablocksCloudserviceplatformisbecomingmoreandmoreandstoretheseblocksonthecloudserver.Periodically,popularbecauseitisregardedasapromisingtechniquethecloudusersinitiateintegrityverificationchallenges.torelieveburdenofthecloudusers’localhardwareandThen,thecloudserverm
8、akesresponsesforthechal-1softwaremainten
