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基于STPA的SSPC不安全控制行为识别与验证
Title:IdentificationandValidationofInsecureControlBehaviorsusingSTPA-basedSSPC
Abstract:
System-TheoreticProcessAnalysis(STPA)isaneffectivetechniqueforanalyzingcomplexsystemstoensuretheirsafety.However,whenitcomestocontrolsystems,solelyfocusingonsafetymaynotbesufficient.Controlsystemsneedtobesecuretoprotectagainstpotentialcyberthreats.Inthispaper,weproposeamethodologybasedonSTPA-basedSecureandSafeProcessControl(SSPC)toidentifyandvalidateinsecurecontrolbehaviorsincontrolsystems.Thismethodologyaimstoenhancethesecurityofcontrolsystemsbyaddressingpotentialvulnerabilitiesandensuringthatcontrolbehaviorsarenotexploitedformaliciouspurposes.
1.Introduction
Industrialcontrolsystems(ICS)playacriticalroleinvarioussectorssuchasenergy,transportation,andmanufacturing.WiththeincreasingintegrationofICSwiththeInternetofThings(IoT)andotherconnectedtechnologies,thepotentialforcyber-attacksoncontrolsystemshasalsogrownsignificantly.Itisessentialtoidentifyandmitigatepotentialvulnerabilitiesincontrolsystemstoensuretheirsecureoperation.ThispaperintroducesthemethodologyofSTPA-basedSSPCfortheidentificationandvalidationofinsecurecontrolbehaviors.
2.System-TheoreticProcessAnalysis(STPA)
STPAisastructuredapproachusedtoanalyzecomplexsystemsandidentifypotentialhazards.Itconsidersthesystemasawholeandanalyzestheinteractionsbetweendifferentcomponentsandactors.STPAprovidesasystematicproceduretoassessthesafetyofasystemandidentifypotentialvulnerabilities.
3.SecureandSafeProcessControl(SSPC)
SSPCisanextensionofSTPAthataimstoaddressthesecurityaspectsofcontrolsystems.Itrecognizesthatcontrolsystemsarenotonlysusceptibletoaccidentsbutalsocyber-attacks.SSPCcombinessafetyandsecurityanalysistoidentifypotentialcontrolvulnerabilitiesthatcouldbeexploitedformaliciouspurposes.
4.MethodologyofSTPA-basedSSPC
TheproposedmethodologycombinestheprinciplesofSTPAandSSPCtoidentifyandvalidateinsecurecontrolbehaviorsincontrolsystems.Thestepsofthemethodologyinclude:
4.1.SystemDescriptionandIdentificationo