reputation estimation and query in peer-to-peer networks

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1、JINLAYOUT3/17/103:05PMPage122ACCEPTEDFROMOPENCALLReputationEstimationandQueryinPeer-to-PeerNetworksXingJin,OracleUSAS.-H.GaryChan,HKUSTABSTRACTunstructuredP2PfilesharingsystemsarehighlyvulnerableifattackersinsertmassivebogusManypeer-to-peersystemsassumethatpeersrecordstopoisonsearchindexes.arec

2、ooperativetoshareandrelaydata.ButinTodetectmaliciouspeersorrewardwelltheopenenvironmentoftheInternet,theremaybehavedones,areputationsystemisoftenused.beuncooperativemaliciouspeers.TodetectInatypicalreputationsystemeachpeerismaliciouspeersorrewardwellbehavedones,aassignedareputationvalueaccordin

3、gtoitsper-reputationsystemisoftenused.Inthisarticleweformancehistory.DifferentiatedservicesaregiveanoverviewofP2Preputationsystemsandthenprovidedtopeersaccordingtotheirreputa-investigatetwofundamentalissuesinthedesign:tion.Whilethebasicideaissimple,apracticalreputationestimationandquery.Weclass

4、ifythesystemdesignisnoteasy.Generally,aP2Prepu-state-of-the-artapproachesintoseveralcate-tationsystemconsistsofthreefunctionalcompo-goriesandstudyrepresentativeexamplesineachnents[2]:collectinginformationonpeercategory.Wealsoqualitativelycomparethembehavior,scoringandrankingpeers,andandoutlineo

5、penissuesforfutureresearch.respondingbasedonpeers’scores.Allthesecomponentsarenontrivial,especiallygiventheINTRODUCTIONfollowingconsideration:•Scalability:AlargeP2PnetworkmayhaveInrecentyearspeer-to-peer(P2P)systemshavehundredsofthousandsofpeers.Forexam-seenenormoussuccessandrichdevelopmentsple

6、,Skypehasseveralmilliononlineusers.overtheInternet.TypicalapplicationsincludeAreputationsystemshouldbehighlyscal-filesharing,streaming,Internettelephony,andableintermsofpeernumber.overlayrouting.AccordingtoCacheLogic•Adaptiontopeerdynamics:PeersmayjoinResearch,in2006P2Ptrafficaccountedforoveror

7、leaveatanytime.Ifreputationinforma-72percentofInternettrafficthatyear.tionismaintainedatpeers,peerleavingInP2Psystemscooperativepeersself-orga-mayleadtoinformationloss.Arobustrep-nizethemselvesintooverlaynetworksandstoreutationsys