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ID:37344933
大小:6.54 MB
页数:137页
时间:2019-05-22
《高速网数据过滤若干关键技术研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、国防科学技术大学博士学位论文高速网数据过滤若干关键技术研究姓名:李云照申请学位级别:博士专业:计算机科学与技术指导教师:王志英;朱中梁20090901国防科学技术大学研究生院博士学位论文连接切换时存取数据少,而且在网络数据中出现的字符串数目较少时匹配速度快,非常适合网络安全应用。4.在上述研究工作的基础上,设计了一种基于基于P流的高速网数据过滤卡。该卡主要针对网络安全分析应用,无需进行协议还原,可以直接针对IP数据包进行分析并逐级过滤掉不关心的数据,从而可以大大减轻后继处理单元的负载,提高整体处理效率。详细的设计和仿真测试表明该卡是可靠的、可实现的。匹配主题词:骨干网网络安全内容监控数据过滤字
2、符串匹配跨包匹配规则第ii页国防科学技术大学研究生院博士学位论文ABSTRACTWiththefastdevelopmentofIntemet,wegetnotonlyconvenience,butalsosomebadinfluence.SomeillegalactivitiesonInteractincludinginformationpollution,attackandcrimebringdamagestoInternetandthreattheinterestoflegalusers.Governmentsandorganizationsputmuchattentionontechn
3、iquesandtoolsforIntemetcontentsupervision,SOthattheabnormaldatacouldbedistinguishedfromnormaldataonIntemetandcriminalactivitiescouldbecontrolledorpunished.DatafilteringonInternetisanimportantmethodtocontrolinformationtransmittingandtomaintaininformationsecurity,bywhichharmfulinformationcouldbemonito
4、redandfiltered.Wi廿lthedevelopmentofbroadbandtechnique,theincreasingnetworkbandwidthhasexceededtheincreasingspeedofCPU,whichbringsgreatlychallengestotheintrusiondetectionsystemsofbackbonenetwork.Sincethespeedofsoftwareprocesscouldnotkeepup、ⅣitllthedemandofIntemetspeed,acceleratingalgorithmsbasedonhar
5、dwarearenecessaryfordatafilteringonIntemet.Inthisthesis,Wefocusedonseveralimportantdatafilteringtechniquessuch弱stringmatching,multi-packetmatchingandrulematching,andproposedsomenewalgorithmsineachfield.Basedontheproposedstringmatchingalgorithms,ahardwarebasedInteractdatafilterwasdesignedandimplement
6、ed.ThenweimprovedthisdatafilterinfunctionsandprocessingspeedanddesignedanInteractdatafiltercard.Simulationprovedtheusabilityandfeasibilityofourworks.Primaryinnovativecontributionsofthisthesiscanbesummarizedasfollows.1.Weproposedthreenewstringmatchingalgorithmswhichcouldbefitforstringsoflargenumbers.
7、(1)MemoryEfficientParallelLongestPrefixMatcher—MEPLPMWaSproposed,whichwasbasedonPLPMandcouldcontainmorestrings.(2)DecoupledQueryandAnalysisParallelLongestPrefixMatche卜——DQAPLPMWasproposed,witllwhichth
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