simplification and analysis of transitive trust networks

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1、1SimplicationandAnalysisofTransitiveTrustNetworksAudunJøsang,ElizabethGrayy,andMichaelKinatederzSchoolofSoftwareEngineeringandDataCommunicationsQueenslandUniversityofTechnology,Australiaa.josang@qut.edu.auyComputerScienceDepartmentTrinityCollegeDublin,Irelandgrayl@cs.tcd.iezInst

2、ituteofParallelandDistributedSystemsFacultyofComputerScience,UniversityofStuttgart,GermanyMichael.Kinateder@informatik.uni-stuttgart.deAbstractWhentransactingandinteractingthroughopencomputernetworks,traditionalmethodsusedinthephysicalworldforestablishingtrustcannolongerbeused.Crea

3、tingvirtualnetworksubstituteswithwhichpeople,or-ganisationsandsoftwareagentscanderivetrustinotherpartiesrequirescomputerisedanalysisoftheunderlyingtrustnetworks.Thisarticledescribesanapproachtotrustnetworkanalysisusingsubjectivelogic(TNA-SL),thatconsistsofthethreefollowingelements.

4、Firstlyitusesaconcisenotationwithwhichtrusttransitivityandparallelcombinationoftrustpathscanbeexpressed.Secondlyitdenesamethodforsimplifyingcomplextrustnetworkssothattheycanbeexpressedinthisconciseform.Finallyitallowstrustmeasurestobeexpressedasbeliefs,sothatderivedtrustcanbeautom

5、aticallyandsecurelycomputedwithsubjectivelogic.WecompareourapproachwithtrustderivationalgorithmsthatarebasedonnormalisationsuchasPageRankandEigenTrust.WealsoprovideanumericalexampletoillustrateshowTNA-SLcanbeapplied.IndexTermsTrust,transitivity,networks,reputation,subjectivelogic,b

6、elief,DSPG,TNA-SL,P2P,PageRank,EigenTrust.I.INTRODUCTIONModerncommunicationmediaareincreasinglyremovingusfromfamiliarstylesofinteractingandconductingbusinessinwaysthattraditionallyrelyonsomedegreeofpre-establishedtrustbetweenbusinesspartners.Moreover,mosttraditionalcuesforassessing

7、trustinthephysicalworldarenotavailablethroughthosemedia.Wemaynowbeconductingbusinesswithpeopleandorganisationsofwhichweknownothing,andwearefacedwiththedifculttaskofmakingdecisionsinvolvingriskinsuchsituations.Asaresult,thetopicoftrustinopencomputernetworksisreceivingconsiderableat

8、tentioninthenetworksecurit