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1、第8章网络安全与信息安全Chapter8networksecurityandinformationsecurityKeycontent:1,cryptography,identificationAccesscontrol,computervirusNetworksecuritytechnologySecurityservicesandsecuritymechanismsInformationsystemsecurityarchitectureframeworkInformationsystemsafetyassessmentcriteriacryptography1,cryp
2、tographyisbasedonthedataconfidentiality,forthepurposeofexchangeofstorageortransmissionofinfonuationtoasecretinordertopreventthetheftofinformationtechnologyofathirdparty.Symmetrickeycryptosystem(privatekeycryptosystem):thesamekeyisusedforencryptionanddecryptionintraditionalcryptography.Commo
3、nalgorithmsare:DES,IDEAEncryptionmodeclassification:(1)sequencepassword:apseudo-randomsequeneeofperformanceisgeneratedbyfinitestatemachine,andtheencryptedinformationf1owisencryptedusingthissequence・(2)theblockcipher:believecomplexfunctionscanbeobtainedbysimplefunctioniterationnumberoflaps,t
4、heprincipleofusingthesimpleloopfunctionandconvolutionoperation,makefulluseofnonlinearoperation.Asymmetrickeycryptosystem(publickeycryptographicsystem):theencryptionanddecryptionofamoderncryptographicsystemUSESadifferentkey.Implementationprocess:eachcommunicationonbothsides,therearetwokeys,K
5、andK',usuallyinsecretcommunicationtopublicencryptionkeyK(calledthepublickey),andkeepthedecryptionkeyK'(calledtheprivatekey),thecommonalgorithmsare:RSAidentificationIdentificationreferstoreliablyverifytheidentityoftheparticipantsacommunicationisconsistentwithwhatheclaimedthattheidentityofthe
6、process,usuallybyacomplexidentityauthenticationprotocoLPasswordtechniqueAuthenticationtags:PINprotectsmemoryCARDSandchallengesresponseCARDSClassification:Sharedkeyauthentication,publickeyauthentication,andzeroknowledgeauthentication(1)theideaofsharingakeycertificateisdevelopedthroughthepass
7、wordauthenticationuser・(1)thepublickeyalgorithmappears2,thesessionkey:referstotheuseinasessionkey,aregenerallynotrandomlygeneratedbymachines,sessionkeywhenusinginpracticeisofteneffectiveinacertaintime,don，treallylimitduringasession.Signature:thetransform
