环签名方案及其在电子投票中应用的研究

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1、西南交通大学硕士学位论文环签名方案及其在电子投票中应用的研究姓名：汪滔申请学位级别：硕士专业：密码学指导教师：唐小虎20070602西南交通大学硕士研究生学位论文第1I页AbstractWiththefastdevelopmentofthenetworksaswellastheappearanceofmoreandmoreinformationsystemsdealingwithgovernmentalaffairs，com-mercialaffairs，andevendailyaffairs，digitalsignature-asubsetofpublic-keycryptolog

2、y-issuretobeattractiveformoreextensiveapplicationsinthecomingyears．Sincetheideaof”digitalsignature"WasfirstlyproposedbyW．DiffieandM．Hellman，manydigitalsignatureshavebeenproposed，suchastheveryfamousschemesofRSA，ElGamal，DSS，etc．Inreal-lifeapplications，itisnecessarytoaddsomeadditionalpropertiestos

3、tandardsignatureschemesmentionedabove．Accordingly,severalsignatureschemeswithspecialpropertieshavebeenproposed，suchasgroupsignature，ringsignature，blindsignature，signcryption，etc．Theresearchesoverthosespecialsignatureschemesmentionedabovewillsurelycontributetothetheoryofinformationsecurityaswell

4、ascryptology,andwillbeofgreatimportancetothedesignofpractical，secureandefficientcryptographicalprotocolsforcommercialaffairs，governmentalaffairs，andmilitaryaffairs．Thisdissertationmaiulystudiesthesespecialsignatures，especiallythethe-oryofringsignature．Thisthesismainlyfocusesontheresearchofrings

5、ignatureschemesbasedonthefinitefieldandgetssomeresults：1．motivatedbyWei’Ssignaturewithoutrandomoracles，weconstuetanewringsignaturebasedonbilinearpairings，whosesecurityreliesontheq-StrongDiffie-HellmanProbleminthestandardmodel．2．WeproposedanelectronicvotingschemebasedOilanonymouscoln-municationc

6、hannelusingringsignatureprotocolandthresholdpro-西南交通大学硕士研究生学位论文第1II页tocal．Theidentityinformationofhonestvoterscanbeprotectedunconditionally．Wecana'lsoprovethatthevotingprivacyandfair-nesscanberealizedsimultaneouslybeforethecounting．Besides，wesolvedthe’’votecollision'’problem．KeyWords：ringsignat

7、ure，digitalsignature，unconditionalanonymity,electronicvoting，threshoMscheme，standardmodel西南交通大学硕士研究生学位论文第1页第1章绪论1．1环签名的研究背景与意义随着社会的信息化发展，越来越多的文件书信需要以数据串的形式通过网络快速传递，这些数据串的来源和完整性都需要认证，而且这些认证常常需要在以后的一段时期内多次霞复，这就需要手写签名的电子替代物一一数字链名(Dig