Security Zones
Using ANSI/ISA-99 Standards to Improve Control System Security
May 2012
Today operators and engineers are under pressure to isolate automation systems at the same time as management is asking for greater interconnectedness.
This White Paper explains how the “zone and conduit” model included in the ANSI/ISA-99 security standards provides a framework for helping deal with network security threats that arise from both the “push for productivity” and the fear of the next “Son-of-Stuxnet” worm.
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Using Tofino to Control Stuxnet
November 2010
Stuxnet is a computer worm designed to target one or more industrial systems that use Siemens PLCs. However, it is aggressive on all networks and can negatively affect any control system.
Stuxnet spreads rapidly using Local Area Network communications and one of the most effective ways to prevent this type of distribution is to make use of zone-based defenses.
This Application Note describes how to divide the control network into security zones and how to use the Tofino Industrial Security Solution to prevent the spread of the Stuxnet worm.
Eric Byres
