广义指定验证者签名体制的研究和设计

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1、西安电子科技大学博士学位论文广义指定验证者签名体制的研究和设计姓名：明洋申请学位级别：博士专业：密码学指导教师：王育民20071201AbstractWjtIltherapiddevelopmentofcomputernetworkandinformationtechnology,howtoeffectivelysolvetheproblemofprivacyassociatedwithapersgninelectroniccommerceapplicationshasbecomemoreandmoreconcerned．Universaldesigna

2、tedverifiersignature(UDVS)schemesarejusttheeffectivetechnologytosolvesuchproblems．Inthissignature，givenasignaturefromthesigner,theprivacyofthesignatureholderisprotectedbyallowinghimtoconvincethedesignatedverifierthatheholdsavalidsignaturefromthesignerwithoutrevealingthesignaturei

3、tself．Therefore，ourpointinthisthesisistostudyanddesignuniversaldesignatedverifiersignatureschemeswithsomespecialpropertiesandverifiablyencryptedsignatureschemesviaformalizationmeansofprovablysecurity．Ourmainachievementsareasfollows：1．Anefficientuniversaldesignatedverifiersignatur

4、eproofschemeisproposed．Wefirstlygivetheformaldefinitionandsecuritymodelandthendescribetheproposedscheme．Finally,weproveitssecurityintherandomoraclemodelandanalyzeitsperformance．2．ArestricteduniversaldesignatedverifiersignatureschemeisfirstlypresentedwhichisprovedtobesecuI_einthes

5、tandardmodel(withoutrandomoracles)．OurschemeistheintegrationofWaterssignatureschemeand(f，Ⅳ)thresholdidea．3．Adesignatedverifierproxysignatureschemeisfirstlyproposedwhichisprovedtobesecureinthestandardmodel．Inthisscheme，thedesignedsignaturewhichiscreatedbytheproxysignercanonlybeche

6、ckedthevaliditybythedesignatedverifier,hence．theprivacyofproxysignercanbeprotected．4．Thenotionofcertificatelessuniversaldesignatedverifiersignatureisfirstlypresentedbystudyingeertificatelesspublickeyeryptosystems．Firstly,wegivetheformaldefinitionandsecuritymodelandthendescribethe

7、proposedconcretescheme．Finally,weproveitssecurityintherandomoraclemodelandanalyzeitsperformance．Ourschemecansolvethekeyescrowproblemwhichseemstobeinherentinidentity-baseduniversaldesignatedverifiersignaturescheme．5．Anefficientverifiablyencryptedsignatureschemeisproposed．Firstly,w

8、egivetheformaldefinitionandsecuritymodel