
86
CYBerseCurItY For InDustrIAL ControL sYsteMs
IT. In eect, the distance between the ICS arch on the left and the
IT arch on the right is a graphical representation of how ICS and IT
dier according to availability assurance requirements.
Figure3.5 qualitatively illustrates the dierence between ICS and
three other IP-based assets and their assurance requirements associ-
ated with the property of integrity. ICS is on the far left and integrity
issues can start at submillisecond interruptions and rapidly escalate to
denial or loss of control situations by the time latency has reached into
the range of seconds. Video assets are likely the nex