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1、《网络安全技术》英文习题集Chapter1IntroductionANSWERSNSWERSTOQUESTIONS1.1WhatistheOSIsecurityarchitecture?TheOSISecurityArchitectureisaframeworkthatprovidesasystematicwayofdefiningtherequirementsforsecurityandcharacterizingtheapproachestosatisfyingthoserequirements.Thedocumentdefinessecurit
2、yattacks,mechanisms,andservices,andtherelationshipsamongthesecategories.1.2Whatisthedifferencebetweenpassiveandactivesecuritythreats?Passiveattackshavetodowitheavesdroppingon,ormonitoring,transmissions.Electronicmail,filetransfers,andclient/serverexchangesareexamplesoftransmiss
3、ionsthatcanbemonitored.Activeattacksincludethemodificationoftransmitteddataandattemptstogainunauthorizedaccesstocomputersystems.1.3Listsandbrieflydefinecategoriesofpassiveandactivesecurityattacks?Passiveattacks:releaseofmessagecontentsandtrafficanalysis.Activeattacks:masquerade
4、,replay,modificationofmessages,anddenialofservice.1.4Listsandbrieflydefinecategoriesofsecurityservice?Authentication:Theassurancethatthecommunicatingentityistheonethatitclaimstobe.Accesscontrol:Thepreventionofunauthorizeduseofaresource(i.e.,thisservicecontrolswhocanhaveaccessto
5、aresource,underwhatconditionsaccesscanoccur,andwhatthoseaccessingtheresourceareallowedtodo).Dataconfidentiality:Theprotectionofdatafromunauthorizeddisclosure.Dataintegrity:Theassurancethatdatareceivedareexactlyassentbyanauthorizedentity(i.e.,containnomodification,insertion,dele
6、tion,orreplay).Nonrepudiation:Providesprotectionagainstdenialbyoneoftheentitiesinvolvedinacommunicationofhavingparticipatedinallorpartofthecommunication.Availabilityservice:Thepropertyofasystemorasystemresourcebeingaccessibleandusableupondemandbyanauthorizedsystementity,accordi
7、ngtoperformancespecificationsforthesystem(i.e.,asystemisavailableifitprovidesservicesaccordingtothesystemdesignwheneverusersrequestthem).Chapter2SymmetricEncryptionandMessageConfidentialityANSWERSNSWERSTOQUESTIONS2.1Whataretheessentialingredientsofasymmetriccipher?Plaintext,enc
8、ryptionalgorithm,secretkey,ciphertext,decryptionalgori
