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1、Attribute-BasedEncryptionforFine-GrainedAccessControlofEncryptedDataVipulGoyal∗OmkantPandey†UCLAUCLAvipul@cs.ucla.eduomkant@cs.ucla.eduAmitSahai‡BrentWaters§UCLASRIInternationalsahai@cs.ucla.edubwaters@csl.sri.comABSTRACTKeywords:Attribute-basedencryption,accesscontrol,au-ditlogs,b
2、roadcastencryption,delegation,hierarchicalidentity-Asmoresensitivedataissharedandstoredbythird-partybasedencryption.sitesontheInternet,therewillbeaneedtoencryptdatastoredatthesesites.Onedrawbackofencryptingdata,isthatitcanbeselectivelysharedonlyatacoarse-grainedlevel1.INTRODUCTION(
3、i.e.,givinganotherpartyyourprivatekey).WedevelopaThereisatrendforsensitiveuserdatatobestoredbynewcryptosystemforfine-grainedsharingofencrypteddatathirdpartiesontheInternet.Forexample,personalemail,thatwecallKey-PolicyAttribute-BasedEncryption(KP-data,andpersonalpreferencesarestoredo
4、nwebportalsitesABE).Inourcryptosystem,ciphertextsarelabeledwithsuchasGoogleandYahoo.Theattackcorrelationcenter,setsofattributesandprivatekeysareassociatedwithac-dshield.org,presentsaggregatedviewsofattacksonthecessstructuresthatcontrolwhichciphertextsauserisableInternet,butstoresin
5、trusionreportsindividuallysubmit-todecrypt.Wedemonstratetheapplicabilityofourcon-tedbyusers.Giventhevariety,amount,andimportanceofstructiontosharingofaudit-loginformationandbroadcastinformationstoredatthesesites,thereiscauseforconcernencryption.Ourconstructionsupportsdelegationofpr
6、ivatethatpersonaldatawillbecompromised.Thisworryisesca-keyswhichsubsumesHierarchicalIdentity-BasedEncryp-latedbythesurgeinrecentattacksandlegalpressurefacedtion(HIBE).bysuchservices.OnemethodforalleviatingsomeoftheseproblemsistoCategoriesandSubjectDescriptors:E.3[DataEn-storedatain
7、encryptedform.Thus,ifthestorageiscompro-cryption]:Publickeycryptosystems.misedtheamountofinformationlosswillbelimited.OnedisadvantageofencryptingdataisthatitseverelylimitstheGeneralTerms:Security.abilityofuserstoselectivelysharetheirencrypteddataatafine-grainedlevel.Supposeaparticul
8、aruserwantstogrant∗Thisres
