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1、ResearchonModelofTrustDegreesforPKIShuwangLVStateKeyLaboratoryofInformationSecurityBeijing,ChinaMingdeZHANGSchoolofInformationEngineeringUniversityofScienceandTechnologyBeijingBeijing,Chinarickchina@263.netWenshengYANGBeijingItownetCyberTech.Ltd.Beijing,ChinaXuefengZHENGSchoolofIn
2、formationEngineeringUniversityofScienceandTechnologyBeijingBeijing,Chinazxfxue@263.netQingguoZHANGUniversityofScienceandTechnologyBeijingBeijing,ChinaAbstract•Inordertoimprovetheaccuracyoftrustevaluationofsubscribers(orkeyholders)fromrelyingparties9pointofview,anewmodeloftrustdegr
3、eesforPKIisproposed.Byanalyzingthesecurityrisksduringtheapplyingandusingprocessofcertificatesandprivatekeys，weintroducenon-trustfactor(NTF);thenbasedonNTF,amethodfortrustdegreesofkeysispresented.Comparingwiththeexistingwork,themodelintegratesseveralcriticalfactorswhichinfluencetru
4、stdegreesofkeysintooneformula,thusimprovingtheaccuracyoftrustevaluationforPKIandbeingapplicabletoavarietyofPKItrustmodels.Keywords・PKI,Non-TrustFactor(NTF),TrustDegrees^ModelI.IntroductionInopennetworks,itisaprerequisiteforsuccessfultransactionsthathowtoestablishtrustrelationships
5、betweenparticipantswhoareunfamiliarordistrusteachother.ThePKIisagoodsolutiontotheaboveproblemofestablishingtrustrelationships,lettingtrustedCAsassourcesofgeneratingtrustandutilizingX.509certificatesasmeansforrepresentinganddeliveringtrust[10].DuetothecomplexityofPKI,thetrustwhichi
6、srepresentedanddeliveredbycertificatesisnotabsolutelycredible,andthereweremanyrelatedresearch.CarlandBruceconsideredthatPKIhas1()majorsecurityrisks[3],andCardEllisonmadeimprovementon4conventionalPKIwisdomsthatwerefalse[5]・HailongLiuproposedaconditionalpredicatecalculuslogicforrepr
7、esentingandreasoningaboutPKItrustmodel,andintroducedaconcept''conditionaltrust11[6].EntrustlistedseveralrisksinfluencingcredibilityofPKIandpresenledriskmanagementstrategicsandways[7].InHengPan'spaperforDoctorsdegree,hemadeanalysisonthekeyfactorsinfluencingthetrustworthinessofPKI,a
8、nddividedthoseinlo3categories:cre
