一种安全高效的虚拟网络结构的设计与实现

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1、北京交通大学硕士学位论文ABSTRACTABSTRACTInternet—basedcloudcomputingcanprovidetousersdynamicandscalablevirtualizedresources，anditsservicesarebasedonadynamicarchitecture，whichcutstheconnectionbetweenthesoftwareandtheapplicationenvironment，SOthattimeCanbesavedfromthemanagementheadachesofcomputingresources．Th

2、eflexibledemandforresourcesisakeycharacteristicofcloudcomputing，becausedifferentusersneeddifferentresourcesduringdifferenttimeperiods，whichrequiresthecloudcomputingsystemtosupporttheself-adaptivemanagementmechanismofserviceresourcesandtoallocatevirtualresourcestodifferentusersduringdifferenttim

3、eperiodsinadynamicway．Inthetraditionalmodeofcloudcomputing，thevirtualcomputingresourcesforusersusuallytakeupthepublicphysicalresourcesinthecloud，whichgreatlysavesthecostofplatformconstructionforcloudcomputing．However，italsoexposesalltheusers’datatothepublicenvironmentandthreatensthedatasecurity

4、．Today，dataencryptioniswidelyusedtoensureitssecurity，butsuchmethodsstillhaveproblemswithsecurityandperformance．Therefore，inordertosolvetheabove-mentionedproblems，thispaperdesignsandconstructsasafeandefficientvirtualnetworkarchitecture，whichdividesthesystemplatformintodifferentsecuritydomainsacc

5、ordingtotheusageofvirtualresources．Whileseparatingtheinformationindifferentsecuritydomainsfrominteractions，thearchitectureensuresthatthevirtualresourcesbelongingtothesamesecuritydomaincanmakeinformationexchanges．Also，thevirtualnetworkarchitecturerealizesacommunicationmechanismbasedonsharedmemor

6、ywhileensuringsecurity．Thisenablesthevirtualresourcestochoosedifferentcommunicationmechanismsaccordingtotheresources’real-timedistributiononthephysicalplatformandgreatlyimprovesthecommunicationbetweenthevirtualres0Urces．Themainworkofthispaperisasfollows：1)Itdesignsandconstructsasecurevirtualnet

7、workarchitecture．Thearchitecturedividesthesystemplatformintodifferentsecuritydomainsaccordingtotheusageofvirtualresources．ThesesecuritydomainsareisolatedfromeachotherandCan’texchangeinformationbetweendifferentsecuritydomains．While