Protecting SCADA Systems with Defense-in-Depth Strategies

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How utilities can utilize multi-layered security approaches

BY RICHARD CLARK, InduSoft

Defense-in-depth is a security strategy first developed by military leaders in which multiple layers of safeguards are placed throughout a system. The concept behind the strategy is that it is more difficult to penetrate a complex and multi-layered defense than to breach a single security measure. The defense-in-depth approach does not simply strive to prevent attacks; it expects them and counters them with coordinated yet disparate safeguards. Moreover, defense-in-depth does not assume an attacker will first attempt to access the SCADA system; it also takes into consideration that a hacker may try to gain unauthorized entry via a less critical area, such as the company website, and then get inside the SCADA system to do greater damage.

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