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1、Lecture14:MessageAuthenticationProtocolsSchoolofSoftwareEngineering,CQUFall,2014AnIntroductiontoInformationSecurity22021/9/16AnIntroductiontoInformationSecurityQuicklyReviewReviewofSecurityServicesMessageAuthentication(鉴别)MessageAuthenticationCode(MAC)CryptographicHashFunc
2、tionRequirementsofHashFunctionMD5SHALecture1132021/9/16AnIntroductiontoInformationSecurityMoreApplicationofHashFunctionPasswordProtectionUserTableId1,user1,pass1Id2,user2,pass2Id3,user3,pass3Id4,user4,pass4….,…….,…...Server42021/9/16AnIntroductiontoInformationSecurityMoreA
3、pplicationofHashFunctionPasswordProtectionServerHash(password)张山123456UserTableId1,user1,#@&?Id2,user2,*&
4、!%Id3,user3,$^~}.Id4,user4,%*!；….,…….,…...52021/9/16AnIntroductiontoInformationSecurityContents3.PrettyGoodPrivacy2.AuthenticationProtocols1.DigitalSignature62021/9/16
5、AnIntroductiontoInformationSecurityLocationsSlidesp7-15aretalkingaboutdigitalsignatureissuewhichcanbefoundinsection13.1ofthetextbook72021/9/16AnIntroductiontoInformationSecurity1.DigitalSignatureAdigitalsignatureordigitalsignatureschemeisamathematicalschemefordemonstrating
6、theauthenticity(真实性)ofadigitalmessageordocument.Avaliddigitalsignaturegivesarecipientreasontobelievethatthemessagewascreatedbyaknownsender,andthatitwasnotalteredintransit.Digitalsignaturesarecommonlyusedforsoftwaredistribution,financialtransactions,andinothercaseswhereitis
7、importanttodetectmodification.82021/9/16AnIntroductiontoInformationSecurity1.DigitalSignatureRequirementsofDigitalSignatureSchemeVerifytheauthor,dateandtimeofthesignatureAuthenticatethecontentsatthetimeofsignatureBeverifiablebythirdpartiestoresolvedisputesSoasto:Thesignatu
8、remustbeabitpatternthatdependsonthemessagebeingsignedUseuniqueinformationofsendertopreventbothforgeryanddenialEasytobeproduced,recognized,andverifiedInfeasibletoforge(伪造)adigitalsignaturePracticalforstorage92021/9/16AnIntroductiontoInformationSecurity1.DigitalSignature1020
9、21/9/16AnIntroductiontoInformationSecurity1.DigitalSignatureAdigitalsignatureneedsapublic
