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1、LocationPrivacyProtectionforSmartphoneUsersKassemFawazandKangG.ShinDept.ofElectricalEngineeringandComputerScience,UniversityofMichiganAnnArbor,Michigan,USA{kmfawaz,kgshin}@umich.eduABSTRACTThesethreatsrangefromanadversary’sabilitytolocalizeanindi-vidualtopro?lingandidentifyinghimbasedont
2、heplaceshevisits.Assmartphonesareincreasinglyusedtorunappsthatprovideuserswithlocation-basedservices,theusers’locationprivacyhasbe-Motivation:comeamajorconcern.Existingsolutionstothisconcernarede?-cientintermsofpracticality,ef?ciency,andeffectiveness.Toad-Toassessusers’perceptionsoflocat
3、ionprivacyandlocation-aware1dressthisproblem,wedesign,implement,andevaluateLP-Guardian,apps,wesurveyed180smartphoneusers.Werecruited70partic-anovelandcomprehensiveframeworkforlocationprivacyprotec-ipantsthroughsocialnetworkannouncementsandtherestthroughtionforAndroidsmartphoneusers.LP-Gu
4、ardianovercomestheAmazonMechanicalTurk.WechoseMechanicalTurkworkersshortcomingsofexistingapproachesbyaddressingthetracking,whohaveachieved“masterquali?cation,"i.e.,thosewhohaveshownpro?ling,andidenti?cationthreatswhilemaintainingappfunction-highcompetencyofperformingtasks.ality.Wehaveimp
5、lementedandevaluatedLP-GuardianonAn-We?ndthesurveyresultssupportingthedeploymentofalo-droid4.3.1.OurevaluationresultsshowthatLP-Guardianeffec-cationprivacyprotectionmechanism.78%oftheparticipantsbe-tivelythwartstheprivacythreats,withoutdeterioratingtheuser’slievethatappsaccessingtheirloc
6、ationcanposeprivacythreats.experience(lessthan10%overheadindelayandenergy).Also,Also,85%ofthemreportedthattheycareaboutwhoaccessestheirLP-Guardian’sprivacyprotectionisshowntobeachievedatatol-locationinformation,comparedto87%reportedbyaMicrosofterablelossinappfunctionality.survey[27]twoye
7、arsago.UsersareevenexpectedtobemoresensitivetowardsthisissueinrelationtotherecentrevelationsonCategoriesandSubjectDescriptorsgovernmentaccessingtheirlocationascollectedbyapps[3].In-terestingly,52%ofthesurveyedindividualsstatednoprobleminC.2.0[COMPUTER-COMMUNICATIONNETWORK
