Industrial Network Security by Robert Moreno

Author:Robert Moreno [Moreno, Robert]
Language: eng
Format: epub
Published: 2018-07-12T23:00:00+00:00

Drawing a series of concentric rings around first the SIS, then around the BPCS, and finally around the business network, as shown in Figure 6-4, will help us discuss defense in layers for security.

Figure 6-4. Cyber Defense in Layers

A cyber attacker would first have to penetrate the corporate firewall to get to the business

network (Layer One). The next target would be the BPCS network (Layer Two), and finally the SIS (Layer Three). If only the business network and BPCS are compromised, the SIS and subsequent safety layers will act to prevent a runaway. If both the BPCS and the SIS are compromised, a runaway is more likely. It can now be prevented only by additional protection layers like operator action or mechanical safety devices such as rupture disks and secondary containment. If all else fails, the consequences would be dealt with through emergency response.

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