基于告警关联的网络安全风险评估方法的分析与实现-analysis and implementation of network security risk assessment method based on alarm association.docx

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2018-06-05 发布于上海
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基于告警关联的网络安全风险评估方法的分析与实现-analysis and implementation of network security risk assessment method based on alarm association.docx

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基于告警关联的网络安全风险评估方法的分析与实现-analysis and implementation of network security risk assessment method based on alarm association

AbstractThenetworksecurityriskassessmentisthebasisofthenetworksecuritymanagement.Therationalityandaccuracyofriskassessmentapproacharehavingdirectimpactontheresultsoftherequirementsanalysisandtheaccuracyofsecuritypolicy.Becauseoftheextremelystrongtimelinessandincreasinglyenhancedinteractionofthemodernnetwork,thusfastandoverallmonitoringofthenetworksecurityriskisespeciallyimportant.It’salsothehottopicintheInformationsecurityfield.Basedonalertcorrelation,theevaluationmethodofnetworksecurityriskcanavoidthelimitationsoftheriskevaluationresultswhichcannotkeepupwiththedynamicchangesandquantifytheevaluationmetricsofnetworksecurityriskreal-time.Themainideasbehindthemethodare:first,usingsecurityalertforriskevaluation;second,assigningevaluationparametersofrelatedresourceinanalyzingsecurityalerts,basedontheevaluationofassets,threatsandvulnerabilities;third,dividingthenetworksystemintosystemservice,hostandnetwork,basedonthehierarchicalevaluationmodelofnetworksecurityrisk.Theriskvalueofeachalertcanreflecttherisksufferedbythehostsystemserviceandaccumulatingitcanquantifythethreatsimposedonthesystemserviceandtherebycalculatetheservicesecurityriskindex.Likewise,hostsecurityriskindexcanbecalculatedbytheindexofthehostservicesecurityriskandnetworksecurityriskindexcanbecalculatedbytheriskindexofhostinthenetwork.Basedonthemethoddiscussedabove,theRASAsystemisimplemented.Itcancollectdatafromlogandalertinformationproducedbyfirewall,IDSandanti-virusdeviceetc.Andformatitwhichisusedtoaggregatealertsusingthealertsimilaritymethod.ThenRASAwillconfirmalertsusingthecross-correlationmethod.Followingthisstep,RASAwilldotherulecorrelationofthealertsandextractassigninginformationoftheevaluationparameters.Andlastly,RASAwillquantifytheevaluationindexandgenerateriskevaluationreportsofalllevels.Experimentalresultsshowthatthemethodiseffectiveincalculatingthequantitativeriskofthecurrentnetworksystem,helpingadministratorstomanagenetworksecurity.Keywords:riskassessment,alertcorrelation,networksecurity目录摘要.......