IEC 62443-3-3 is a cornerstone document for implementing robust cybersecurity for controls engineers. It lays out detailed system security requirements aligned with seven foundational principles, ranging from user/device authentication to ensuring resource availability, Control reported.
These foundational requirements help engineers ensure that both machinery and control systems are secure, resilient and reliable. Notably, the widely accepted zone and conduit model introduced by ISA-99 supports segmentation of networks and equipment, enabling targeted security measures based on risk and function.
Additionally, the emergence of zero trust as a cybersecurity paradigm is highly relevant for engineers integrating IT, OT and IoT systems. Zero trust emphasizes three components that align closely with IEC 62443’s foundational requirements: continuous verification, least privilege and an "assume breach" mindset.
By applying defense-in-depth strategies, controls engineers can break down machinery and communication paths to the level of individual devices or applications, enforcing strict access controls and maintaining system integrity. Learn more from Control in this article.
