
84 Handbook of SCADA/Control Systems Security
the control system is to help the company generate that wealth effectively, efciently,
and safely. So, when we are discussing the security around control systems, we are
looking at an infrastructure that most likely supports an organization’s critical path
(but may not, depending on what business line it supports) but which itself is often
interpreted as being critical infrastructure because of the impacts associated with
public safety (Figure 4.3).
The rst layer identies a general business line, for example production operations
(the assembly line). There are a series of discrete business functi ...