密码编码学与网络安全系统第五版问题详解

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1、Chapter1:Introduction5Chapter2:ClassicalEncryptionTechniques7Chapter3:BlockCiphersandtheDateEncryptionStandard13Chapter4:FiniteFields21Chapter5:AdvancedEncryptionStandard28Chapter6:MoreonSymmetricCiphers33Chapter7:ConfidentialityUsingSymmetricEncryption38Chapter8:IntroductiontoNumberTheory42C

2、hapter9:Public-KeyCryptographyandRSA46Chapter10:KeyManagement;OtherPublic-KeyCryptosystems55Chapter11:MessageAuthenticationandHashFunctions59Chapter12:HashandMACAlgorithms62Chapter13:DigitalSignaturesandAuthenticationProtocols66Chapter14:AuthenticationApplications71Chapter15:ElectronicMailSec

3、urity73Chapter16:IPSecurity76Chapter17:WebSecurity80Chapter18:Intruders83Chapter19:MaliciousSoftware87Chapter20:Firewalls89AnswerstoQuestions1.1TheOSISecurityArchitectureisaframeworkthatprovidesasystematicwayofdefiningtherequirementsforsecurityandcharacterizingtheapproachestosatisfyingthose-1

4、31-requirements.Thedocumentdefinessecurityattacks,mechanisms,andservices,andtherelationshipsamongthesecategories.1.2Passiveattackshavetodowitheavesdroppingon,ormonitoring,transmissions.Electronicmail,filetransfers,andclient/serverexchangesareexamplesoftransmissionsthatcanbemonitored.Activeatt

5、acksincludethemodificationoftransmitteddataandattemptstogainunauthorizedaccesstocomputersystems.1.3Passiveattacks:releaseofmessagecontentsandtrafficanalysis.Activeattacks:masquerade,replay,modificationofmessages,anddenialofservice.1.4Authentication:Theassurancethatthecommunicatingentityistheo

6、nethatitclaimstobe.Accesscontrol:Thepreventionofunauthorizeduseofaresource(i.e.,thisservicecontrolswhocanhaveaccesstoaresource,underwhatconditionsaccesscanoccur,andwhatthoseaccessingtheresourceareallowedtodo).Dataconfidentiality:Theprotectionofdatafromunauthorizeddisclosure.Dataintegrity:Thea

7、ssurancethatdatareceivedareexactlyassentbyanauthorizedentity(i.e.,containnomodification,insertion,deletion,orreplay).Nonrepudiation:Providesprotectionagainstdenialbyoneoftheentitiesinvolvedinacommunicationofhavingparticipatedinallorpartofthec