基于身份密码体制应用研究

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1、.基于身份的密码体制的研究学号：14610125姓名：李桂珍学院：计算机工程与科学学院专业：计算机技术..基于身份的密码体制的研究李桂珍1+1(上海大学计算机工程与科学学院,上海200444)KeyManagementSchemeinIdentity-basedCryptosystemsLiGui-Zhen1+1(DepartmentofComputerEngineeringandScienceTechnology,ShanghaiUniversity,Shanghai200444,China)Abstract:Intrad

2、itionalcertificatebasedPublicKeyCryptosystems(PKC,theCertifyingAuthority(CA)andusersneedalotoftimeandstoragespacefordealingwiththecertificateandpublickey,furthermore,theverificationofcertificateisSOtroublesomeTosimplifythecertificatemanagementprocessandreducetheco

3、st，Adi．ShamirintroducedtheconceptofIdentity-basedCryptosystemsin1984．TheideaofIdentity-basedCryptosystemsisfromthepostalsystemofoursociety.InsuchcryptosystemsthepublickeyofauserisderivedfromhisidentityinformationandhisprivatekeygeneratedbyatrustedthirdpartycalledPr

4、ivaleKeyGenerator(PKG).Forexample,theE-mailaddressortheidentitycardnumbercanbepublickeyofuser．Withtheseadvantages，theIdentitybasedcryptosystemshasbeenthemostactiveareaofresearchandcureentlyisofgreatinteresttothecryptographicsociety．Theidentitycryptosystemsovercome

5、stheoftraditionalidentitybasedcryptographyproblemPKC，butsuffersfromtwoinherentproblems，keyeSgTOWandSeCwechannelrequirement．ThePKGhastheknowledgeofuser’sprivatekeyandthereforeCandeeryptanycipherTextorforgesignatureonanymessagewhimisknownaskeyescrowMoreoverkeyissuin

6、grequiressecurechanneltoavoideavesdropping．Thesecurityofanycryptosystemreliesonthesecurityofkey,SOthekeyManagementplaysaftimportantroleincryptology.Thekeymanagementincludeskeygeneration,keydistribution．keyagreementereMultipartykeyagreementisanimportantpartofkeyman

7、agement.Cureently’theidentity-basedkeyagreementhasmanyresearchresults,butalmostallofidentity-basedkeyagreementprotocolscallnotbeexpandedintotheinstanceinwhichthemuhpartycomefromdifferentPKG).Inthispaper,wefocusonthekeyescrowproblemofidentity—basedcryptosystemsandi

8、dentity-basedkeyagreementprotocolKeywords:Keyagreement,Keyissuingprotocol,Identity—basedcryptosytems摘要:在基于证书的公钥密码系统中需要大量的时间和存储空问来签发、存储用户的证书和公钥而且