p2p reputation management probabilistic estimation

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1、ComputerNetworks50(2006)485–500www.elsevier.com/locate/comnetP2Preputationmanagement:Probabilisticestimationvs.socialnetworksZoranDespotovic*,KarlAbererEcolePolytechniqueFe´de´raledeLausanne(EPFL),SchoolofComputerandCommunicationSciences,CH-1015Lausanne,SwitzerlandAvailableonline15Au

2、gust2005AbstractManagingtrustisakeyissueforawideacceptanceofP2Pcomputing,particularlyincriticalareassuchase-com-merce.Reputation-basedtrustmanagementhasbeenidentifiedintheliteratureasaviablesolutiontotheproblem.Thecurrentworkinthefieldcanberoughlydividedintotwogroups:socialnetworksthat

3、relyonaggregatingtheentireavailablefeedbackinthenetworkinhopeachievingasmuchrobustnessagainstpossiblemisbehavioraspossibleandprobabilisticmodelsthatrelyonthewellknownprobabilisticestimationtechniquesbutuseonlyalimitedfractionoftheavailablefeedback.Inthispaperweprovidefirstanoverviewof

4、thesetechniquesandthenacomprehensivecom-parisonofthetwoclassesofapproaches.Wetesttheirperformanceagainstvariousclassesofcollusivepeerbehaviorandanalyzetheirpropertieswithrespecttotheimplementationcoststheyincurandtrustsemanticstheyoffertothedecisionmakers.Ó2005ElsevierB.V.Allrightsres

5、erved.Keywords:P2Psystems;Trust;Reputation;Socialnetworks;Probabilisticestimation1.Introductionpeercommercewithoutintermediariesandcentralinstitutions,e.g.,throughP2Pnetworks.However,Theavailabilityofubiquitouscommunicationtohavewidelyacceptede-commerceinP2Pnet-throughtheInternetisdr

6、ivingthemigrationofworksonehastoeliminateoratleastminimizecommerceandbusinessfromdirectinteractionstheaccompanyingrisksandthreats.Theyorigi-betweenpeopletoelectronicallymediatedinterac-nateprimarilyinthefollowingrequirements:tions.Itisalsoenablingatransitiontopeer-to-•Theenvironmentm

7、ustbeopen,meaningthat*theuserscanjoinandleaveitwhentheywantCorrespondingauthor.Tel.:+41216935260;fax:+41216938115.to.ThisleavestheusersastrongfeelingofE-mailaddress:zoran.despotovic@epfl.ch(Z.Despotovic).autonomyandindependenceandcanresultin1389-1286/$-seefrontmatterÓ2005ElsevierB.V.A

8、llrightsrese