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1、SECURITYANDCOMMUNICATIONNETWORKSSecurityComm.Networks(2009)PublishedonlineinWileyInterScience(www.interscience.wiley.com).DOI:10.1002/sec.171SPECIALISSUEPAPERAchallenge-basedtrustestablishmentprotocolforpeer-to-peernetworksPei-TeChen∗andChi-SungLaihDepartmentofElectricalEngine
2、ering,NationalChengKungUniversityNo.1,Ta-HsuehRoad,Tainan701,TaiwanABSTRACTEstablishingtrustrelationshipsbetweenpeersisanessentialapproachtopreventthreats.Mostcurrentapproachesconcentrateonpollingalgorithmstoevaluatepeertrustworthiness,buttheseapproachesareeithersystem-expensi
3、veorinefficient.Inthispaper,weproposeaconcretechallenge-basedtrustprotocolforP2Pnetworks.Ourprotocoluseschallenge-responseoperationsineachtrustevaluationphaseandvalidateseverycontactedpeeralongwithrecordingtheircorrespondingtrustvalue.Theschemeinourprotocolutilizesrandomselecti
4、onofchallenges,anddoesnotrevealadditionalinformation,somaliciouspeershavelittleopportunitytotamperwiththeP2Psystems.Simulationresultsshowourprotocolsavescommunicationcostbyaround90%.Wesuggestatolerancevalueof0.2whichgivesadesignreferenceforimplementingnewP2Ptrust-establishingp
5、rotocols.Copyright©2009JohnWiley&Sons,Ltd.KEYWORDSreputation-basedtrustschemes;Peer-to-peer(P2P)networks;challenge-basedtrustprotocol;pollingalgorithms*CorrespondencePei-TeChen,DepartmentofElectricalEngineering,NationalChengKungUniversityNo.1,Ta-HsuehRoad,Tainan701,Taiwan.E-ma
6、il:peder@crypto.ee.ncku.edu.tw1.INTRODUCTIONuntiltheTTL(TimetoLive,alsodenotedassearchdepth)ofmessagesisdepleted.Unfortunately,theoverheadofthisPeer-to-peer(P2P)networkshaveintroducedanewmethodbroadcasttrafficdoesnotscalewell,especiallyinalargefordatadistributionandhavebecomeve
7、rypopularinrecentP2Penvironment.years.Unliketraditionalclient-servermodels,eachpeerAnotherproblemisestablishingtrustrelationshipsinP2Pnetworksplaysthesameroleofactingnotonlyamongpeersinformofpositiveornegativefeedback.asaclientbutalsoasaserver,withnospecificpowerForthis,therear
8、ethreatssuchaswhitewashing,falseasanadministratororsupervisor
