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1、320IEEETRANSACTIONSONMOBILECOMPUTING,VOL.11,NO.2,FEBRUARY2012ProtectingLocationPrivacyinSensorNetworksagainstaGlobalEavesdropperKiranMehta,DonggangLiu,Member,IEEE,andMatthewWright,Member,IEEEAbstract—Whilemanyprotocolsforsensornetworksecurityprovideconfidentialityforthecontentofmes
2、sages,contextualinformationusuallyremainsexposed.Suchcontextualinformationcanbeexploitedbyanadversarytoderivesensitiveinformationsuchasthelocationsofmonitoredobjectsanddatasinksinthefield.Attacksonthesecomponentscansignificantlyundermineanynetworkapplication.Existingtechniquesdefen
3、dtheleakageoflocationinformationfromalimitedadversarywhocanonlyobservenetworktrafficinasmallregion.However,astrongeradversary,theglobaleavesdropper,isrealisticandcandefeattheseexistingtechniques.Thispaperfirstformalizesthelocationprivacyissuesinsensornetworksunderthisstrongadversar
4、ymodelandcomputesalowerboundonthecommunicationoverheadneededforachievingagivenleveloflocationprivacy.Thepaperthenproposestwotechniquestoprovidelocationprivacytomonitoredobjects(source-locationprivacy)—periodiccollectionandsourcesimulation—andtwotechniquestoprovidelocationprivacytod
5、atasinks(sink-locationprivacy)—sinksimulationandbackboneflooding.Thesetechniquesprovidetrade-offsbetweenprivacy,communicationcost,andlatency.Throughanalysisandsimulation,wedemonstratethattheproposedtechniquesareefficientandeffectiveforsourceandsink-locationprivacyinsensornetworks.I
6、ndexTerms—Sensornetworks,locationprivacy.Ç1INTRODUCTIONwirelesssensornetwork(WSN)typicallyconsistsofaintermediatesensors.Anadversary(thehunter)mayuseAlargenumberofsmall,multifunctional,andresource-thecommunicationbetweensensorsandthedatasinkstoconstrainedsensorsthatareself-organize
7、dasanadhoclocateandthencapturethemonitoredpandas.Ingeneral,networktomonitorthephysicalworld[1].Sensornetworksanytarget-trackingsensornetworkisvulnerabletosuchareoftenusedinapplicationswhereitisdifficultorattacks.Asanotherexample,inmilitaryapplications,theinfeasibletosetupwirednetwo
8、rks.Examplesincludeenemyca
