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1、DefeatingIMSICatchersFabianvandenBroekRoelVerdultJoerideRuiterInstituteforComputingandInstituteforComputingandSchoolofComputerScienceInformationSciencesInformationSciencesUniversityofBirmingham,RadboudUniversityNijmegen,RadboudUniversityNijmegen,UnitedKingdomTheNetherl
2、ands.TheNetherlands.j.deruiter@cs.bham.ac.ukf.vandenbroek@cs.ru.nlrverdult@cs.ru.nlABSTRACT1.INTRODUCTIONIMSIcatchingisaproblemonallgenerationsofmobileIncellulartechnologiesitisunavoidablethatthemobiletelecommunicationnetworks,i.e.,2G(GSM,GPRS),3Gtelecommunicationprovi
3、ders(whichwewillrefertoassim-(HDSPA,EDGE,UMTS)and4G(LTE,LTE+).Currently,plyprovidersfortherestofthispaper)needtoknowthe1theSIMcardofamobilephonehastorevealitsidentityapproximatelocationoftheirusers,inordertobeabletooveraninsecureplaintexttransmission,beforeencryptionro
4、uteincomingtraffictothemastcurrentlynearesttotheisenabled.Thisidentifier(theIMSI)canbeintercepteduser.Thiscanleadtoserious(location)privacyissuesforbyadversariesthatmountapassiveoractiveattack.Suchtheusers,astheirapproximatelocationiscontinuouslymon-identityexposureattack
5、sarecommonlyreferredtoas‘IMSIitored.However,ifweacceptthisissue,forinstancebecausecatching’.SincetheIMSIisuniquelyidentifying,unautho-wetrusttheproviders,thentherearestillmanyotherpri-rizedexposurecanleadtovariouslocationprivacyattacks.vacyissuesrelatedtomobiletelephon
6、y,suchasappsshar-Weproposeasolution,whichessentiallyreplacestheIM-ingprivatedata[2]oreavesdroppingphoneconversationsSIswithchangingpseudonymsthatareonlyidentifiableby[3].Oneofthefirstpracticalprivacyattacksagainstmo-thehomenetworkoftheSIM’sownnetworkprovider.Con-bilephon
7、eswastheso-calledIMSIcatchingattack,andthissequently,thesepseudonymsareunlinkablebyintermedi-attackpersistsevenintoday’smobilenetworkstandards.atenetworkprovidersandmaliciousadversaries,andthere-Thistermreferstotheuniqueidentifierpresentinevery2foremitigatebothpassivean
8、dactiveattacks,whichwealsoSIMcard,calledtheIMSIforInternationalMobileSub-formallyverifiedusingProVerif.Oursolutionisco
