数字签名理论及应用若干研究

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1、电子科技大学博士学位论文数字签名理论及应用若干研究姓名：王明文申请学位级别：博士专业：计算机应用技术指导教师：朱清新20071129摘要在Web服务和XML签名的研究中，首先比较系统的分析了Web服务的技术架构体系，随后给出了一种基于UML对XMLSchema文档进行辅助设计的方法和一种从关系模式向XMLSchema转换的方法，然后重点分析了XML数字签名规范，并与传统的数字签名进行了对比，最后以上述面向授权子集的环签名方案为例，给出了其对应的面向授权子集环XML签名表示以及相应的签名和验证过程。关键词：密码学，数字签名，门限方案，群签名，环签名ⅡABSTRAC

2、TTheinformationsecurityhasbecomemoreandmorecrucialwiththedevelopmentofcomputerandnetworktechnologies．Comparedwithothertechnologiesininforma—tionsecurity,thedigtalsignatureisimportantespeciallyintheauthentication，datain-tegrity,andnon．repudiation．Ithasbeenwidelyusedinmilitary,communic

3、ation，e—commerceande-government，etc．Themaininterestofthisdissertationisonthethe。oryandmethodofdigitalsignatureanditsapplication．Theresearchfocusesonsomekeyproblemsofdigitalsignatureschemes，suchasthresholdsignature，groupsignature，ringsignatureandXMLsignature．Thesearestudiedonthebasiso

4、fmanyresearchworksofalotofacademiciansandexperts，andsomenewdigitalsignatureschemesareproposed．Intheresearchesofthresholdsignature，themainworkisasfollows：(1)Anewthresholdsignatureschemewithoutatrustedcenterisproposed．Differentfrompreviousschemesbasedondiscretelogarithm，theproposedsche

5、meisonthebasisofBoneheta1．，sschemeforefficientgenerationofsharedRSAkeysandShamir’Sperfectsecretsharingscheme．(2)InordertOdistributethepowerofverifyingthesignatureofames—sage，anewthresholdsharedverificationsignatureschemewithspecifiedreceivinggroupsisproposed．TheschemeisonthebasisofSh

6、amir’SthresholdsecretsharingschemeandamodifiedRSAsignaturescheme．Itavoidstheproblemofcalculatingre—versesforarbitraryelementsinstructuresandboththecomputationaleffortsandcorn—mumcationcostsofitaresmall．(3)Byextendingthethresholdsharedverificationsig‘naturescheme，anewgeneralizedshared

7、verificationsignatureschemewithspecifiedreceivinggroupsisproposed．TheschemebuildsonamodifiedE1Gamaldigitalsigna‘tureschemeandBrickell’Svectorspacesecretsharingschemeandissecureandeffi—cient．htheresearchesofthegroupsignature，toavoidtheshortcomingsofseveralpre—viousthresholdgroupsignat

8、ureschemes，a