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1、ZhaoHY,LiXL.H-Trust:Agrouptrustmanagementsystemforpeer-to-peerdesktopgrid.JOURNALOFCOMPUTERSCIENCEANDTECHNOLOGY24(5):833{843Sept.2009H-Trust:AGroupTrustManagementSystemforPeer-to-PeerDesktopGridHuanyuZhao(赵环宇),StudentMember,IEEE,andXiaolinLi(李晓林),Member,A
2、CM,IEEEScalableSoftwareSystemsLaboratory,DepartmentofComputerScience,OklahomaStateUniversity,StillwaterOK74078,U.S.A.E-mail:fhuanyu,xiaoling@cs.okstate.eduRevisedJuly9,2009.AbstractPeer-to-PeerDesktopGrid(P2PDG)hasemergedasapervasivecyber-infrastructureta
3、cklingmanylarge-scaleapplicationswithhighimpacts.Asaburgeoningresearcharea,P2PDGcansupportnumerousapplications,includingscienti¯ccomputing,¯lesharing,webservices,andvirtualorganizationforcollaborativeactivitiesandprojects.Tohandletrustworthinessissuesofth
4、eseservices,trustandreputationschemesareproposedtoestablishtrustamongpeersinP2PDG.Inthispaper,weproposearobustgrouptrustmanagementsystem,calledH-Trust,inspiredbytheH-indexaggregationtechnique.LeveragingtherobustnessoftheH-indexalgorithmunderincompleteandu
5、ncertaincircumstances,H-Trusto®ersarobustpersonalizedreputationevaluationmechanismforbothindividualandgrouptrustswithminimalcommunicationandcomputationoverheads.WepresenttheH-Trustschemein¯vephases,includingtrustrecording,localtrustevaluation,trustqueryph
6、ase,spatial-temporalupdatephase,andgroupreputationevaluationphases.Therationaleforitsdesign,theanalysisofthealgorithmarefurtherinvestigated.TovalidatetheperformanceofH-Trustscheme,wedesignedtheH-TrustsimulatorHTrust-Simtoconductmulti-agent-basedsimulation
7、s.SimulationresultsdemonstratethatH-Trustisrobustandcanidentifyandisolatemaliciouspeersinlargescalesystemsevenwhenalargeportionofpeersaremalicious.Keywordspeer-to-peerdesktopgrid,reputation,trustmanagement,H-index1IntroductionReputation-basedsystemsarepro
8、posedtoestablishtrustamongpeersinP2Psystems[4].InareputationBecauseofitssalientfeaturesofextremescala-system,eachentity'shistorybehaviorsisusedtopre-bility,°exibility,self-con¯guration,self-organization,dicthowitisg
