By default, a converged ICS network is generally open. Openness facilitates both technology coexistence and ICS device interoperability, which helps enable the choice of best-in-class ICS products. This openness, as well as the fact that in many cases, ICS devices cannot be secured because of age or device restrictions, requires that configuration and architecture must secure and harden ICS networks. The degree of hardening depends upon the required security stance. Business practices, corporate standards, security policies, application requirements, industry security standards, regulatory compliance, risk management policies, and overall tolerance to risk are key factors in determining the appropriate ...
The CPwE industrial network security framework
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