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1、AnatomizationandProtectionofMobileApps’LocationPrivacyThreatsKassemFawaz,HuanFeng,andKangG.Shin,UniversityofMichiganhttps://www.usenix.org/conference/usenixsecurity15/technical-sessions/presentation/fawazThispaperisincludedintheProceedingsofthe24thUSENIXSecuritySymposiumAugust12–14,2015•W
2、ashington,D.C.ISBN978-1-931971-232OpenaccesstotheProceedingsofthe24thUSENIXSecuritySymposiumissponsoredbyUSENIXAnatomizationandProtectionofMobileApps’LocationPrivacyThreatsKassemFawaz,HuanFeng,andKangG.ShinTheUniversityofMichigan{kmfawaz,huanfeng,kgshin}@umich.eduAbstractHowever,fewofthem
3、havebeendeployedastheyre-quireapporsystem-levelmodifications,bothofwhichMobileusersarebecomingincreasinglyawareofthepri-areunappealing/unrealistictotheordinaryusers.vacythreatsresultingfromappsaccessoftheirloca-Facedwithlocation-privacythreats,usersarelefttion.Fewofthesolutionsproposedthus
4、fartomitigateonlywithwhatevercontrolstheappsandOSesprovide.thesethreatshavebeendeployedastheyrequireeitherSome,butnotall,appsallowtheuserstocontroltheirapporplatformmodifications.Mobileoperatingsystemslocationaccess.OSeshavebeenimprovingonthisfront.(OSes)alsoprovideuserswithlocationaccessc
5、ontrols.iOSincludesanewpermissiontoauthorizelocationac-Inthispaper,weanalyzetheefficacyofthesecontrolsincessinthebackground,orwhentheappisnotactivelycombatingthelocation-privacythreats.Forthisanalysis,used.Also,iOS,WindowsOS,andBlackberry(An-weconductedthefirstlocationmeasurementcampaigndro
6、idtofollowsuit)utilizeper-applocation-accessper-ofitskind,analyzingmorethan1000freeappsfrommissions.TheuserauthorizeslocationaccessattheveryGooglePlayandcollectingdetailedusageoflocationfirsttimeanappaccesseshislocationandhastheoptionbymorethan400location-awareappsand70Advertise-tochangeth
7、isdecisionforeverysubsequentappinvoca-mentandAnalytics(A&A)librariesfrommorethan100tion.Wewanttoanswertwoimportantquestionsrelatedparticipantsoveraperiodrangingfrom1weekto1year.tothis:(i)arethesecontrolseffectiveinprotectingtheSurprisingly,70%oftheappsandtheA&Alibra
