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密码编码学与网络安全答案优质资料(可以直接使用，可编辑优质资料，欢迎下载）Chapter1:Introduction5Chapter2:ClassicalEncryptionTechniques7Chapter3:BlockCiphersandtheDateEncryptionStandard13Chapter4:FiniteFields21Chapter5:AdvancedEncryptionStandard28Chapter6:MoreonSymmetricCiphers33Chapter7:ConfidentialityUsingSymmetricEncryption38Chapter8:IntroductiontoNumberTheory42Chapter9:Public-KeyCryptographyandRSA46Chapter10:KeyManagement;OtherPublic-KeyCryptosystems55Chapter11:MessageAuthenticationandHashFunctions59Chapter12:HashandMACAlgorithms62Chapter13:DigitalSignaturesandAuthenticationProtocols66Chapter14:AuthenticationApplications71Chapter15:ElectronicMailSecurity73Chapter16:IPSecurity76Chapter17:WebSecurity80Chapter18:Intruders83Chapter19:MaliciousSoftware87Chapter20:Firewalls89AnswerstoQuestions1.1TheOSISecurityArchitectureisaframeworkthatprovidesasystematicwayofdefiningtherequirementsforsecurityandcharacterizingtheapproachestosatisfyingthoserequirements.Thedocumentdefinessecurityattacks,mechanisms,andservices,andtherelationshipsamongthesecategories.1.2Passiveattackshavetodowitheavesdroppingon,ormonitoring,transmissions.Electronicmail,filetransfers,andclient/serverexchangesareexamplesoftransmissionsthatcanbemonitored.Activeattacksincludethemodificationoftransmitteddataandattemptstogainunauthorizedaccesstocomputersystems.1.3Passiveattacks:releaseofmessagecontentsandtrafficanalysis.Activeattacks:masquerade,replay,modificationofmessages,anddenialofservice.1.4Authentication:Theassurancethatthecommunicatingentityistheonethatitclaimstobe.Accesscontrol:Thepreventionofunauthorizeduseofaresource(i.e.,thisservicecontrolswhocanhaveaccesstoaresource,underwhatconditionsaccesscanoccur,andwhatthoseaccessingtheresourceareallowedtodo).Dataconfidentiality:Theprotectionofdatafromunauthorizeddisclosure.Dataintegrity:Theassurancethatdatareceivedareexactlyassentbyanauthorizedentity(i.e.,containnomodification,insertion,deletion,orreplay).Nonrepud
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