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1、IEEEJOURNALONSELECTEDAREASINCOMMUNICATIONS,VOL.24,NO.2,FEBRUARY2006305InformationTheoreticFrameworkofTrustModelingandEvaluationforAdHocNetworksYanLindsaySun,Member,IEEE,WeiYu,StudentMember,IEEE,ZhuHan,Member,IEEE,andK.J.RayLiu,Fellow,IEEEAbstract—Theperformanceofadhocnetwor
2、ksdependsonco-peer-to-peernetworks[19],[20],andadhocandsensornet-operationandtrustamongdistributednodes.Toenhancesecu-works[21]–[23].However,therearestillmanychallengesneedrityinadhocnetworks,itisimportanttoevaluatetrustworthi-tobeaddressed.nessofothernodeswithoutcentralize
3、dauthorities.Inthispaper,TrustDefinition:Althoughdefinitionsoftrusthavebeenbor-wepresentaninformationtheoreticframeworktoquantitativelymeasuretrustandmodeltrustpropagationinadhocnetworks.Inrowedfromthesocialscienceliterature,thereisnoclearcon-theproposedframework,trustisameas
4、ureofuncertaintywithsensusonthedefinitionoftrustindistributedcomputernet-itsvaluerepresentedbyentropy.WedevelopfourAxiomsthatad-works.Trusthasbeeninterpretedasreputation,trustingopinion,dressthebasicunderstandingoftrustandtherulesfortrustprop-probability[24],etc.agation.Base
5、dontheseaxioms,wepresenttwotrustmodels:en-TrustMetrics:Asanatureconsequenceoftheconfusiontropy-basedmodelandprobability-basedmodel,whichsatisfyalltheaxioms.Techniquesoftrustestablishmentandtrustupdateintrustdefinition,trusthasbeenevaluatedinverydifferentarepresentedtoobtaint
6、rustvaluesfromobservation.Thepro-ways.Someschemesemploylinguisticdescriptionsoftrustre-posedtrustevaluationmethodandtrustmodelsareemployedinlationship,suchasinPGP[19],PolicyMaker[12],distributedadhocnetworksforsecureadhocroutingandmaliciousnodede-trustmodel[14],trustpolicyl
7、anguage[15],andSPKI/SDSItection.Adistributedschemeisdesignedtoacquire,maintain,andpublic-keyinfrastructure[13].Insomeotherschemes,contin-updatetrustrecordsassociatedwiththebehaviorsofnodesfor-wardingpacketsandthebehaviorsofmakingrecommendationsuousordiscretenumericalvaluesa
8、reassignedtomeasuretheaboutothernodes.Simulationsshowthattheproposedtrusteval-leve
