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1、SurveyofReputationSystemsforP2PNetworksMatthiasPernerTechnischeUniversit¨atDarmstadtAbstract.Peer-to-peernetworksoftenlacktrustbetweeninteractingpeers.Onesolutionforthisproblemarereputationsystemswhichtrytoimplementandadaptmethodsalreadyknownfromtherealworldfortheonlineworld.Iwillpresentrequiremen
2、tsforreputationsystemsanddiscussproblemstheysu?erfrominP2Pnetworks.Furthermore,Iwillpresentthreeexamples.1IntroductionInpeer-to-peer(P2P)networksallpeershaveequalrightsandresponsibilitiesandnocentralinstanceexiststhatregulatesinteractions.Asaresultpeerscantrytotrickaroundtheirresponsibilities.Ther
3、eforeP2Pnetworksoftensu?erfromalackofqualityintheirservices.Thisproblemisrootedinthelackofpossibilitiestodistinguishbetweengoodandmaliciouspeers.Inthepastpeopleusedthisshortcomingtofreerideortointroduceincorrectcontent,likemusic?leswithwrongnames,inthosenetworks.Ifthesethingshappeningreatnumber,th
4、eyleadtounsatisfactoryservices.ThereforeitisessentialfortheimprovementoftheP2Pnetworksthatwe?ndmethodsthathelptodistinguishmaliciouspeersfromgoodones.Furthermore,wewantthesemethodstogivetheusersanincentiveforgoodbehavior.Thiswaywecouldincreasethetrustbetweengoodpeersandhelptodecreasetheamountofint
5、eractionswithbadpeers.Accordingto[3],thenaturalwayofbuildingtrustisusingthereputationoftheassociate.InthefollowingpaperwewillhavealookatreputationsystemsforP2Pnetworks.InSection2,wewilllookatsomedi?erencesbetweeninteractionsintheo?ineandtheonlineworldanddiscusssomeproblemstosolve.IntheSections3,4a
6、nd5,wediscusssomereputationsystemsbrie?yandhavelookattheirtechniques.Insection6,wewillgiveashortsummaryofthepaperandhaveasmalloutlookwhatneedstobedoneinfutureworks.2ReputationandTrustIntheo?ineworldwedohavelongtimeIdentitiesandmostinteractionsarebetweenwellknownpartners.Ifwedonotknowourpartnerours
7、elf,thetrustisoftenbasedonrumoursoronexperiencesafriendmade.Asaresultofthis,futureinteractionswithanentitycanbein?uencedbypastinteractions.Wetendtocallthisthereputationofthepartner.Keepingthatinmindwecanbuildasys
