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1、FutureGenerationComputerSystems26(2010)13171326ContentslistsavailableatScienceDirectFutureGenerationComputerSystemsjournalhomepage:www.elsevier.com/locate/fgcsPoisonedwater:AnimprovedapproachforaccuratereputationrankinginP2PnetworksWangYufenga,b,d,,AkihiroNakaoc,daStateKeyL
2、aboratoryofNetworkingandSwitchingTechnology,BeijingUniversityofPostsandTelecommunications,Beijing,ChinabNanjingUniversityofPostsandTelecommunications,Nanjing,ChinacUniversityofTokyo,JapandNationalInstituteofInformationandCommunicationsTechnology(NICT),Japanarticleinfoabstract
3、Articlehistory:Itisarguedthatsocial-networkbased(orgroup-based)trustmetriciseffectiveinresistingvariousReceived16October2008attacks,whichevaluatesgroupsofassertions``intandem'',andgenerallycomputespeers'reputationReceivedinrevisedformranksaccordingtopeers'socialpositionsinatr
4、ustgraph.However,unfortunately,mostgroup-based22February2009trustmetricsarevulnerabletotheattackof``frontpeers'',whichrepresentsmaliciouscolludingpeersAccepted11May2009whoalwayscooperatewithothersinordertoincreasetheirreputation,andthenprovidemisinformationAvailableonline19Ma
5、y2009topromoteactivelymaliciouspeers.Intraditionalreputationrankingalgorithms,likeEigentrustandPowertrust,etc.,frontpeerscouldpassmostoftheirreputationvaluetomaliciousfriends,whichKeywords:leadstomaliciouspeersaccruinganimproperlyhighreputationranking.ThispaperproposesanTrust
6、andreputationrankingP2Palternativesocial-networkbasedreputationrankingalgorithmcalledPoisonedwater,toinfermoreSocial-networkaccuratereputationranksthenexistingschemes,whenfacingfrontpeersattack.Ourcontributionsaretwofold:firstwedesigntheframeworkofthePoisonedwaterapproachincl
7、udingthefollowingthreeprocedures:(1)thepropagationofPoisonedWater(PW):throughdirecttransactionsorobservations,severalmalicioususersareidentified,termedasthepoisonedseeds,andthePWwilliterativelyfloodfromthosepoisonedseedsalongthereverseindegreedirectioninthetrustgraph;(2)thede
8、terminationofadaptiveSpreadingFactor(SF)fromPWlevel:basedonthelogist
