Usable Global Network Access Policy for PCS
نویسندگان
چکیده
With the nation’s increasing awareness of the importance of securing the computer/communication infrastructure of process control systems (PCS), recommendations for their configuration have appeared, most notably NIST Special Publication SP-800-82 [1]. Some of these recommendations concern network connectivity, specifically describing near isolation of some subnetworks from the PCS. Security mechanisms that formalize these kinds of notions are known as network access control policy. However, while recommendations like those in NIST SP-800-82 refer to rules that ought to be enforced globally over an entire network, in practice the enforcement of network access control is distributed among firewalls that enforce some local policies, defined by their rule sets.
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