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ID:36565369
大小:4.03 MB
页数:106页
时间:2019-05-12
《滥用入侵检测系统中入侵表示的研究》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、东南大学博士学位论文滥用入侵检测系统中入侵表示的研究姓名:孙美凤申请学位级别:博士专业:计算机应用技术指导教师:龚俭20071228中英文摘要由于入侵表示与实现它的ins是紧耦合的,使得即使在检测语言、安全专家和形式检查的多方努力下入侵检测规则正确无误,仍不代表IDS就得到期望的检测结果,这与滥用IDS的实现质量有关,因此最后研究评估滥用IDS实现质量的方法。从滥用IDS的原理出发,本文分析了目前评估方法在应用于滥用IDS时存在的问题,提出对规则库和IDS实现分别评估的原则,重点研究了IDS实现的测度选取,并分类讨论了测度计算的总体思路。在
2、此基础上,本文给出了面向滥用IDS实现的评估系统的实现模型,并实现了一个评估原型系统。尽管在实现中做了简化,但原型系统基本保持了评估方法的思想,目前它可以用于基于单报文分析的入侵检测系统的性能评测。利用原型系统对所在实验室的IDS和Snort的实验表明:本文方法能够更真实地反映出滥用IDS的质量,具有很好的实用性。关键字:入侵特征,入侵表示,滥用检测,入侵检测系统中英文摘要AbstractBecausethemisuse-basedintrusiondetectionsystems(IDSs)gaitidentifyattackswitha
3、cceptableaccuracyandtendtoproducefewerfalsealarmsthananomaly—basedcousins,nearlyallcommercialsystemsandmostdeployedinstallationsu∞misusedetectionapproach.Meanwhile,musttoday'sseriousattacksarecomplexmulti—stagescenarios.Itiswell—knownto/dent/fythesecompoundattacksbymisused
4、etectionapproachthroughextractingthesignatureofeachphaseandcorrelatingthem.misuse-besedapproachwillplayanmoreimportantroleinintrusiondetectionarea.Oneproblemwithmisuse-baseddetectionsystemsisthattheirabilitytOreliablydetectattacksisstronglyaffectedbythequalityoftheirruleba
5、ses.Iftherulebaseisn’tcompletetheIDSwillgeneratefalsenegatives,andiftherulebaseisn’taccuratethe1DSwillgeneratefalsepositives.Unfortunately,therolebaseismanuallybuiltbyhumanexperts.Asaconsequence,everyphaseofintrusionrepresentation,forexamplecreatingallabstractsignature,cod
6、ingitwithdetectionlanguage,possiblyresultsinthedegradationofrulebase’squality.Therefore,manuallywritinggoodintrusiondetectionrulesishardandresolzrce.intensive.Asnewattacksarecontinuouslyoccurringandmostofthemaremulti-phaseones,itbecomesmoreandmoredifficulttomanuallyassuret
7、hequailtyofrolebase.Soitisrealisticandurgenttosystematicallystudyintrusionrepresentationandtodevelopapproachesandtoolsthataidtoimprovingthequalityofrulebase.Sothispaperstudiestheintrusionrepresentationprobleminmisuse-basedIDSs.Thepapersystematicallyanalyzestheaspectsthatca
8、usethedegradationofrolebase’squality,exploresvariousapproachesandtoolstoresistthisdegrada
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