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On the Impossibility of Cryptography Alone for

On the Impossibility of Cryptography Alone for

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时间：2019-07-20

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1、OntheImpossibilityofCryptographyAloneforPrivacy-PreservingCloudComputingMartenvanDijkAriJuelsRSALaboratoriesRSALaboratoriesmarten.vandijk@rsa.comajuels@rsa.comAbstractForallthebenefitsofcloudcomputing,though,itde-privesclientsofdirectcontroloverthesystemsthatman-Cloudcomputingdenotesanarch

2、itecturalshifttowardagetheirdata.Thusarisesacentralconcernofcloudthinclientsandconvenientlycentralizedprovisionofcomputing:Howcanclientstrustthatacloudprovidercomputingresources.Clients’lackofdirectresourcewillprotecttheprivacyoftheirdata,i.e.,notleaktheircontrolinthecloudpromptsconcernab

3、outthepotentialdataoritselfusetheirdatainappropriately?fordataprivacyviolations,particularlyabuseorleakageInthispaper,weexploreprivacyprotectionincloudofsensitiveinformationbyserviceproviders.Cryptog-architectures.Inparticular,weconsiderthechallengeofraphyisanoft-toutedremedy.Amongitsmost

4、power-havingacloudservicerunapplicationsoverclientdatafulprimitivesisfullyhomomorphicencryption(FHE),while:(1)Notbeingabletolearnanyinformationitselfdubbedbysomethefield’s“HolyGrail,”andrecentlyand(2)Releasingoutputvaluestoclientsinaccordancerealizedasafullyfunctionalconstructwithseemingwi

5、thanaccess-controlpolicy.Wearguethatbyitself,promiseforcloudprivacy.cryptography—andbyimplication,anylogicallayerin-Wearguethatcryptographyalonecan’tenforcetheformationsecuritytool—can’tsolvethisprobleminitsprivacydemandedbycommoncloudcomputingser-fullgenerality.Yetthisprivacy-preservingm

6、odelisex-vices,evenwithsuchpowerfultoolsasFHE.Wefor-actlytheoneultimatelydesiredforcloudapplicationsin-mallydefineahierarchyofnaturalclassesofprivatevolvingmultipletenants,suchassocialnetworking,doc-cloudapplications,andshowthatnocryptographicpro-umentsharing,andsoforth.Givenrecentexciteme

7、nttocolcanimplementthoseclasseswheredataissharedoverthepotentialofnew,powerfulconstructssuchasamongclients.Wepositthatusersofcloudserviceswillfullyhomomorphicencryption(FHE)[11]tosupportthealsoneedtorelyonotherformsofprivacyenforcement,privacyneedsofcloudcomputing,w

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