identity crisis anonymity vs. reputation in p2p systems

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1、IdentityCrisis:Anonymityvs.ReputationinP2PSystems¤SergioMartiandHectorGarcia-MolinaStanfordUniversityStanford,CA94305fsmarti,hectorg@cs.stanford.eduAbstractformofpersistentnodeidentification.Inordertobuildreputation,auserornodemusthavesomeformofidentityTheeffectivenesso

2、freputationsystemsforpeer-to-peerwhichisvalidoveraperiodoftime.Thelongerthisperiodresource-sharingnetworksislargelydependentonthereli-oftime,andthemoreresistanttheidentityistospoofing,theabilityoftheidentitiesusedbypeersinthenetwork.Muchmoreaccuratelythereputationsystem

3、canratenodes[13].debatehascenteredaroundhowcloselyone’spseudo-ThesimplestwaytoidentifyanodeistouseitsIPad-identityinthenetworkshouldbetiedtotheirreal-worlddress.Thismethodisseverelylimitedbecauseaddressesidentity,andhowthatidentityisprotectedfrommaliciousarevulnerablet

4、oIP-spoofingandpeersareoftendynam-spoofing.InthispaperweinvestigatethecostinefficiencyicallyassignedtemporaryIPaddressesbytheirISPs.In-oftwosolutionstotheidentityproblemforpeer-to-peerrep-stead,amorereliablemethodmaybetouseself-signedcer-utationsystems.Ourresultsshowthat,

5、usingsomesimpletificates.Thistechniqueallowswell-behavednodestobuildmechanisms,reputationsystemscanprovideafactorof4totrustbetweeneachotheroveraseriesofdisconnectionsand20improvementinperformanceovernoreputationsystem,reconnectionsfromdifferentIPaddresses.Althoughmali-d

6、ependingontheidentitymodelused.ciousnodescanalwaysgeneratenewcertificatesmakingitdifficulttodistinguishthemfromnewusers,thistechniquepreventsthemfromimpersonatingexistingwell-behavednodes.1.IntroductionSomearguethattheonlyeffectivesolutiontotheiden-tityprobleminthepresen

7、ceofmaliciousnodesistouseaTheincreaseinwide-areanetworkbandwidthandcom-centraltrustedloginserver,whichassignsanodeidentitymoditycomputingpowerhaspromotedtheuseofpeer-to-basedonaverifiablereal-worldidentity[1].Thiswouldpeer(P2P)systems.P2Psystemsallowanyusertosharelimita

8、maliciousnode’sabilitytomasqueradeasseveralresourceswhilemaintainingautonomyandindependencenodesandtochangeidentities