choosing re putableserventsinapzpnetwork.

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1、ChoosingReputableServentsinaP2PNetworkF.CornelliE.DamianiS.DeCapitanidiVimercatiS.ParaboschiP.Samaratifcornelli@crema.unimi.itdamiani,samarati
@dti.unimi.itdecapita@ing.unibs.itparabosc@elet.polimi.ithttp://seclab.dti.unimi.it.DTI-Universita`diMilanoDEA-Universita`diBres

2、ciaDEI-PolitecnicodiMilanoEleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.1/19OutlineMotivationP2PbasicsP2PissuesOurapproach(P2PRepprotocol)BasicpollingEnhancedpollingprotocolImplementationoftheP2PRepprotocolConclusionsandfutureworkEleventhInte

3、rnationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.2/19MotivationP2PsolutionsarecurrentlyreceivingconsiderableinterestMostP2Psystemsprotectpeers’anonymityAnonymityopensthedoortopossiblemisusesandabusesmalicioususersexploittheP2PnetworktodistributeTrojanHorses

4、andvirusesEleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.3/19MotivationP2PsolutionsarecurrentlyreceivingconsiderableinterestMostP2Psystemsprotectpeers’anonymityAnonymityopensthedoortopossiblemisusesandabusesmalicioususersexploittheP2Pnetworkto

5、distributeTrojanHorsesandvirusesPeerreviewprocess:thepeers’opinionsisusedtoestablishareputationforpeersEleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.3/19PeertoPeerBasics(1)Allthenodesofferthesameservicesandfollowthesamebehavior(server+client)

6、P2Pnetworksforfileexchangeinvolvestwophases:1.Searchoftheserventswheretherequestedinformationresides2.DownloadfromtheexportingserventstherequestedinformationEleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.4/19PeertoPeerBasics(2)Centralizedindexe

7、s(Napster)EleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.5/19PeertoPeerBasics(2)CentralizedIndexesEleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.5/19PeertoPeerBasics(2)Centralizedindexes(Napster)PureP2Parchitecture

8、(Gnutella)EleventhInternationalWorldWideWebConferencecSabrinaDeCapitanidiVimercati–p.5/19Peerto