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1、StudyofPositionSecurityinLocationServiceinMobileAdHocNetworksChineseJournalofElectronicsVo1.15,No.3,July2006StudyofPositionSecurityinLocationServiceinMobileAdHocNetworks术HUABei,LIAOHongbo,XIONGYanandGUOYan(DepatmentofComputerScience&Technology,Uni
2、versityofScience&TechnologyofChina,Hefei23002%Chian)Abstract—ThisPaPerresearchesintothepositionse-curityprobleminlocationserviceinmobileadhocnet.works,andonthebasisofwhichsetsforwardandimple-mentsanode-hidingprotoco1.Firstlyitanalyzestheorig-inati
3、onoftheprobleminmobileadhocnetworks,andsug-geststhatbothnodepositionandnodesigniflcanceshouldbecovereduP.Thenitdiscussesindetailthedesignideaofthenode-hidingprotocol,whichguaranteesthepositionsecuritybyusingarandomizedanddynamicallychangedkeywordtodec
4、oupletherelationshipbetweenpermanentidentifierandgeographicallocationofnode,andfurtherassuresthesecuritybydistributingkeywordonlyamongtrustednodes.Afterthat,itgivesabriefdescriptionoftheprotocol,includingmessagedefinition,procedureforjoin-ingandleavin
5、gatrustgroup,andkeywordsynchronizationwithinatrustgroup.Finally,itpresentsthesimulationschemeandanalyzesthesimulationresults,whichshowthatourprotocolworkswellindynamiccircumstances.Webelievethatthisnode-hidingprotocolcouldgreatlyimprovethepositionsecu
6、rityofmobilenodes,whileatthesametimeretainstheirfunctionsofprovidingcommonroutingandlocationsservicesinnetwork;sothisprotocolcouldbecomeaveryimportantcomplementtonowadayslocationservices.Keywords——Mobileadhocnetworks,Locationservice,Positionsecurity.I
7、.IntroductionRoutinginMobileadhocnetworkfMANET1isratherchallengingduetotherapidlychangedtopologyofthenet—work.Uptonow,alltheapproachesproposedcouldbedividedintotopology-basedandposition—basedroutingtlJ.Theformerusesinformationaboutlinksexistinginthene
8、tworktoper-formpacketforwarding.Itbehavespoorlyinhighlydynamicnetworksinceeachnodeneedstomaintaincertainamountofpaths(atleastthosecurrentlyinuse1.Thelatterusespo-sitionsofthedestination,one.hopneighborsanditsowntoperformpacketforwarding,andsca
