finetrust a finegrained trust model for p2p networks.

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1、SECURITYANDCOMMUNICATIONNETWORKSSecurityComm.Networks.(2009)PublishedonlineinWileyInterScience(www.interscience.wiley.com)DOI:10.1002/sec.165FineTrust:afine-grainedtrustmodelforpeer-to-peernetworksYizhiRen1,2∗,†,MingchuLi1andKouichiSakurai21SchoolofSoftware,DalianUniversityofTechnology

2、,Dalian116621,China2DepartmentofComputerScienceandCommunicationEngineering,KyushuUniversity,Hakozaki,Fukuoka812-81,JapanSummaryTrustresearchisakeyissueinpeer-to-peer(P2P)networks.Reputation-basedtrustmodelsasoneofthegoodsolutionstoresolvethetrustproblemsinP2Pnetworkarereceivedmoreandm

3、oreattentioninrecentyears.Oneofthefundamentalchallengesistocapturetheevolvingnatureofatrustrelationshipbetweenpeersandreflectthevariedbiasorpreferenceofpeersinadistributedandopenenvironment.Inthispaper,wepresentafine-grainedtrustcomputationmodelforP2Pnetworks.Ourmodeldefinestheserviceasa

4、fined-grainedquality-of-service(QoS)(N-dimensionalvector),andinordertoaccuratetherecommendationtrustcomputing,severalconceptsareintroducedtoreflecttherecommenders’currentstatus,historybehavior,andthegapbetweenthesetwobehaviors.Also,wefirstlyintroducetheGauss-barfunctiontomeasuretheprefer

5、encesimilaritybetweenpeers.AllthesewillresultinaflexiblemodelwhichrepresentstrustinamannermoreclosetohumanintuitionsandsatisfiesthediverseQoSrequirementsofpeersinP2Pnetworks.Theextensivesimulationshaveconfirmedtheefficiencyofourmodel.Copyright©2009JohnWiley&Sons,Ltd.KEYWORDS:granularity;r

6、eputation;trustmodel;similaritymeasure;P2P1.BackgroundandMotivationcomplicatesthedesignofmechanismsfordetectingandpreventingmaliciousbehaviorinautonomousPeer-to-peer(P2P)networksdefineaclassofsystemsenvironments.Currentresearchabouttrustmodelandapplicationsinwhichautonomouspeerspoolthe

7、irvariesonthetrustdescription,evaluation,reasoning,computingresourcesandcollaboratetoperformacomputing,andsoon.Unfortunately,fewofthemsospecialtask.Peershaveanidenticalfunctionalityandfarhavewellresolvedthefollowingissues:(1)context-playtheroleinbothserversandclients.Unfortunately,bas

8、edtru