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1、WangYF,HoriY,andSakuraiK.CharacterizingeconomicandsocialpropertiesoftrustandreputationsystemsinP2Penvironment.JOURNALOFCOMPUTERSCIENCEANDTECHNOLOGY23(1):129{140Jan.2008CharacterizingEconomicandSocialPropertiesofTrustandReputationSystemsinP2PEnvironmentYu-FengWang1(王玉峰),Yoshiak
2、iHori2(堀良彰),andKouichiSakurai2(樱井幸一)1CollegeofTelecommunicationsandInformationEngineering,NanjingUniversityofPostsandTelecommunicationsNanjing210000,China2DepartmentofComputerScienceandCommunicationEngineering,KyushuUniversity,Fukuoka812-0053,JapanE-mail:wfwang@njupt.edu.cn;wf
3、wang@itslab.csce.kyushu-u.ac.jpReceivedJuly7,2007;revisedOctober18,2007.AbstractConsideringthefactthatP2P(Peer-to-Peer)systemsareself-organizedandautonomous,social-controlmechanism(liketrustandreputation)isessentialtoevaluatethetrustworthinessofparticipatingpeersandtocombatthe
4、sel¯sh,dishonestandmaliciouspeerbehaviors.So,naturally,weadvocatethatP2Psystemsthatgraduallyactasanimportantinformationinfrastructureshouldbemulti-disciplinaryresearchtopic,andre°ectcertainfeaturesofoursociety.So,fromeconomicandsocialperspective,thispaperdesignstheincentive-co
5、mpatiblereputationfeedbackschemebasedonwell-knowneconomicmodel,andcharacterizesthesocialfeaturesoftrustnetworkintermsofe±ciencyandcost.Speci¯cally,ourframeworkhastwodistinctivepurposes:¯rst,fromhigh-levelperspective,wearguetrustsystemisaspecialkindofsocialnetwork,andanaccurate
6、characterizationofthestructuralpropertiesofthenetworkcanbeoffundamentalimportancetounderstandthedynamicsofthesystem.Thus,inspiredbytheconceptofweightedsmall-world,thispaperproposesnewmeasurementstocharacterizethesocialpropertiesoftrustsystem,thatis,highglobalandlocale±ciency,a
7、ndlowcost;then,fromrelativelow-levelperspective,wearguethatreputationfeedbackisaspecialkindofinformation,anditisnotfree.So,basedoneconomicmodel,VCG(Vickrey-Clarke-Grove)-likereputationremunerationmechanismisproposedtostimulaterationalpeersnotonlytoprovidereputationfeedback,but
8、truthfullyo®erfeedback.Furthermore,consideringthattrustandrep
