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1、华中科技大学博士学位论文普适计算安全的关键技术研究姓名：郭亚军申请学位级别：博士专业：信息安全指导教师：洪帆20060401华中科技大学博士学位论文制模型能够达到这个要求。该模型使用动态信任模型扩展了基于角色的访问控制模型，用基本信任决定用户角色的分配，用动态信任决定角色的激活和许可的激活。用户的访问权限随着信任值动态变化。如何保护用户隐私是普适计算最具挑战性的难题。提出一个用户隐私保护的理论分析模型，该模型有助于评估和分析隐私保护机制以及帮助设计新的隐私保护方案。同时也给出了一个普适计算用户隐私保护协议。该协议
2、不仅允许服务提供者对用户的认证，同时也可以保护用户隐私，防止重放攻击以及设备间的恶意串通。关键词：普适计算；信任模型；资源限制信任协商；认证；访问控制；隐私保护II华中科技大学博士学位论文AbstractPervasivecomputingistheintegrationofcyberspaceandphysicalspace.Inthisincorporatedspace,userscanobtaindigitalservicesnon-intrusivelyanytimeandanywhere.However
3、,theubiquitousandmobileenvironmentintroducesanewsecuritychallenge.Becauseoftheunpredictabilityofthecooperatedprincipals,itisunsuitabletousetraditionalsecuritymechanismssuitedforstaticnetworkorclosedsystemstosolveproblemsoccurinpervasivecomputingenvironment.In
4、addition,theincorporatedspacemakesitmoredifficulttoprotectusers’privacy.Inpervasivecomputingenvironment,inordertoprovideusersservicesimplicitlyandspontaneously,systemmustobtaincontextinformationthroughubiquitousdevicesembeddedinthesurrounding.Ontheotherhand,i
5、fthesecurityofthecomputersystemcouldnotbeensured,users’privacywouldbeexposedentirelytointruders.Therefore,securityisthebiggestchallengethepervasivecomputingwillmeet.Thereexistfourkeysecurityproblemsthatarebarrierstopervasivecomputing.Theseare:trustmodel,authe
6、ntication,accesscontrolandprivacy.Forestablishingtrustmodelofpervasivecomputing,thereexisttwochallengingproblems:oneishowtoexpressthedynamiccharacteristicoftrust.Anotherishowtoestablishinitialtrust.Adynamictrustmodelisproposedtoaddressthesetwoproblems.Trustin
7、thismodelincludesbasictrustanddynamictrust.Theformationofbasictrustisbasedonresource-constrainedtrustnegotiationorthepastinteractionresult,whiledynamictrustdependsoncontextinformation.Thismodelalsodiscussesthequestionssuchashowtoformtrust,whattrustparametersa
8、re,andhowtoevaluatetheseparameters,howtocalculatecombinationtrustlevel,howtodenotetrust,howtocomparetwotrustvaluesandhowtorenovatetrustlevel.Adequatetrustlevelbetweentwostrangerusersmustb
