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DACCDistributedAccessControlinClouds.pdf

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2011InternationalJointConferenceofIEEETrustCom-11/IEEEICESS-11/FCST-11 DACC:DistributedAccessControlinClouds SushmitaRuj,AmiyaNayakandIvanStojmenovic SEECS,UniversityofOttawa, OttawaK1N6N5,Canada Email:{sruj,anayak,ivan}@site.uottawa.ca Abstract—Weproposeanewmodelfordatastorageandaccessphicencryptiontechniques[9],[10].Usersendshomomor- inclouds.Ourschemeavoidsstoringmultipleencryptedcopiesphiclyencryptedmessages,whilethecloud(withoutknowing ofsamedata.Inourframeworkforsecuredatastorage,cloudtheactualdata)performscomputationsontheseencrypted storesencrypteddata(withoutbeingabletodecryptthem). Themainnoveltyofourmodelisadditionofkeydistributionmessagesandreturnstheresultstotheuser.Codeobfuscation centers(KDCs).WeproposeDACC(DistributedAccessControltechniques[11]canalsobeusedsothattheuserwishingto inClouds)algorithm,whereoneormoreKDCsdistributekeysexecuteitsprograminthecloudwillnotbeabletounderstand todataownersandusers.KDCmayprovideaccesstoparticularthecode,butonlybeprovidedwiththeresults.Animportant fieldsinallrecords.Thus,asinglekeyreplacesseparatekeysproblemistoanonymouslysearchdatastoredinclouds,with fromowners.Ownersandusersareassignedcertainsetof attributes.Ownerencryptsthedatawiththeattributesithasanddifferenttypesofqueries(e.g.,range,multidimensional,or storestheminthecloud.Theuserswithmatchingsetofattributescomplexqueries).Thisisachievedbymeansofsearchable canretrievethedatafromthecloud.Weapplyattribute-basedencryption[12],[13],whichtakeskeywordsinencrypted encryptionbasedonbilinearpairingsonellipticcurves.Theform,searchesthedatabasesbycheckingtheindicesofthe schemeiscollusionsecure;twouserscannottogetherdecodeanyencryptedkeywords,andreturnsresults,withoutknowingthe datathatnoneofthemhasindividualrighttoaccess.DACCalso supportsrevocationofusers,withoutredistributingkeystoallkeywordortheretrievedrecords.Efficientandsecurekeyword theusersofcloudservices.Weshowthatourapproachresultssearchesarerequiredinclouds,whichmaintainlargeamounts inlowercommunication,comp