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1、Where’sWally?PreciseUserDiscoveryAttacksinLocationProximityServicesIasonasPolakisGeorgeArgyrosTheofilosPetsiosSuphanneeSivakornAngelosD.KeromytisNetworkSecurityLab,ComputerScienceDept.ColumbiaUniversity,NewYork,NY,USA{polakis,argyros,theofilos,suphannee,angelos}@
2、cs.columbia.eduAbstractpreservingapproachoflocationproximity:notifyingusersaboutwhoisnearby,andatwhatdistance.However,whenLocationproximityschemeshavebeenadoptedbysocialtheexactdistancetoauserisrevealedbytheservice,trilat-networksandothersmartphoneappsasameanso
3、fbalanc-erationattacksbecomefeasible,withseveralexamplesbeinginguserprivacywithutility.However,misconceptionsaboutpresentedinthemediarecently.Articleshavealsoreportedtheprivacyo eredbyproximityserviceshaverenderedusersthattheEgyptiangovernmentusedtrilaterationt
4、olocatevulnerabletotrilaterationattacksthatcanexposetheirlo-andimprisonusersofgaydatingapps[7,9].Whiletheuseofcation.Suchattackshavereceivedmajorpublicityand,asatrilaterationhasnotbeencon rmed,suchreportshighlightresult,popularserviceprovidershavedeployedcounte
5、rmea-thepotentialseverityofsuchattacks,andtheimportanceofsuresforpreventinguserdiscoveryattacks.preservingthelocationalprivacyofusers.Naturally,theseInthispaper,wesystematicallyassessthee ectivenessofreportshavecaughttheattentionofpopularservices,whichthedefens
6、esthatproximityserviceshavedeployedagainstinturnhavedeployeddefensemechanismstopreventlocal-adversariesattemptingtoidentifyauser'slocation.Wepro-izationattacks[2].videthetheoreticalfoundationforformalizingtheproblemInthispaper,weexploretheprivacyguaranteesof10u
7、nderdi erentproximitymodels,designpracticalattackspopularsocialnetworksandLBS.Weaudittheservicesandforeachcase,andprovetightboundsonthenumberofidentifythemechanismsdeployedtoprotectthelocationqueriesrequiredforcarryingouttheattacks.Toevaluatetheprivacyoftheirus
8、ers.Toevaluatethedefensesthathavecompletenessofourapproach,weconductextensiveexperi-beenadoptedbytheindustry,weformalizetheproblemofmentsagainstpopularservices.Whileweidenti
