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1、WangYF,HoriY,andSakuraiK.CharacterizingeconomicandsocialpropertiesoftrustandreputationsystemsinP2Penvironment.JOURNALOFCOMPUTERSCIENCEANDTECHNOLOGY23(1):129{140Jan.2008CharacterizingEconomicandSocialPropertiesofTrustandReputationSystemsinP2PEnvironmentYu-FengWang1(王玉峰),YoshiakiHori2(堀良彰
2、),andKouichiSakurai2(樱井幸一)1CollegeofTelecommunicationsandInformationEngineering,NanjingUniversityofPostsandTelecommunicationsNanjing210000,China2DepartmentofComputerScienceandCommunicationEngineering,KyushuUniversity,Fukuoka812-0053,JapanE-mail:wfwang@njupt.edu.cn;wfwang@itslab.csce.kyu
3、shu-u.ac.jpReceivedJuly7,2007;revisedOctober18,2007.AbstractConsideringthefactthatP2P(Peer-to-Peer)systemsareself-organizedandautonomous,social-controlmechanism(liketrustandreputation)isessentialtoevaluatethetrustworthinessofparticipatingpeersandtocombatthesel¯sh,dishonestandmaliciouspe
4、erbehaviors.So,naturally,weadvocatethatP2Psystemsthatgraduallyactasanimportantinformationinfrastructureshouldbemulti-disciplinaryresearchtopic,andre°ectcertainfeaturesofoursociety.So,fromeconomicandsocialperspective,thispaperdesignstheincentive-compatiblereputationfeedbackschemebasedonw
5、ell-knowneconomicmodel,andcharacterizesthesocialfeaturesoftrustnetworkintermsofe±ciencyandcost.Speci¯cally,ourframeworkhastwodistinctivepurposes:¯rst,fromhigh-levelperspective,wearguetrustsystemisaspecialkindofsocialnetwork,andanaccuratecharacterizationofthestructuralpropertiesofthenetw
6、orkcanbeoffundamentalimportancetounderstandthedynamicsofthesystem.Thus,inspiredbytheconceptofweightedsmall-world,thispaperproposesnewmeasurementstocharacterizethesocialpropertiesoftrustsystem,thatis,highglobalandlocale±ciency,andlowcost;then,fromrelativelow-levelperspective,wearguethatr
7、eputationfeedbackisaspecialkindofinformation,anditisnotfree.So,basedoneconomicmodel,VCG(Vickrey-Clarke-Grove)-likereputationremunerationmechanismisproposedtostimulaterationalpeersnotonlytoprovidereputationfeedback,buttruthfullyo®erfeedback.Furthermore,consideringthattrustandrep
