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1、《网络安全技术》英文习题集Chapter1IntroductionANSWERSNSWERSTOQUESTIONS1.1WhatistheOSIsecurityarchitecture?TheOSISecurityArchitectureisaframeworkthatprovidesasystematicwayofdefiningtherequirementsforsecurityandcharacterizingtheapproachestosatisfyingthoserequirements.Thedocumentdefinessecurityatta
2、cks,mechanisms,andservices,andtherelationshipsamongthesecategories.1.2Whatisthedifferencebetweenpassiveandactivesecuritythreats?Passiveattackshavetodowitheavesdroppingon,ormonitoring,transmissions.Electronicmail,filetransfers,andclient/serverexchangesareexamplesoftransmissionsthatca
3、nbemonitored.Activeattacksincludethemodificationoftransmitteddataandattemptstogainunauthorizedaccesstocomputersystems.1.3Listsandbrieflydefinecategoriesofpassiveandactivesecurityattacks?Passiveattacks:releaseofmessagecontentsandtrafficanalysis.Activeattacks:masquerade,replay,modific
4、ationofmessages,anddenialofservice.1.4Listsandbrieflydefinecategoriesofsecurityservice?Authentication:Theassurancethatthecommunicatingentityistheonethatitclaimstobe.Accesscontrol:Thepreventionofunauthorizeduseofaresource(i.e.,thisservicecontrolswhocanhaveaccesstoaresource,underwhatc
5、onditionsaccesscanoccur,andwhatthoseaccessingtheresourceareallowedtodo).Dataconfidentiality:Theprotectionofdatafromunauthorizeddisclosure.Dataintegrity:Theassurancethatdatareceivedareexactlyassentbyanauthorizedentity(i.e.,containnomodification,insertion,deletion,orreplay).Nonrepudia
6、tion:Providesprotectionagainstdenialbyoneoftheentitiesinvolvedinacommunicationofhavingparticipatedinallorpartofthecommunication.Availabilityservice:Thepropertyofasystemorasystemresourcebeingaccessibleandusableupondemandbyanauthorizedsystementity,accordingtoperformancespecificationsf
7、orthesystem(i.e.,asystemisavailableifitprovidesservicesaccordingtothesystemdesignwheneverusersrequestthem).Chapter2SymmetricEncryptionandMessageConfidentialityANSWERSNSWERSTOQUESTIONS2.1Whataretheessentialingredientsofasymmetriccipher?Plaintext,encryptionalgorithm,secretkey,cipherte
8、xt,decryptionalgori
