Why is the integration of physical security measures considered a critical component of cyber resilience for Operational Technology (OT) environments?

The integration of physical security measures is a critical component of cyber resilience for Operational Technology (OT) environments because it directly protects the physical infrastructure and systems that underpin industrial operations, preventing various attack vectors that logical cybersecurity controls alone cannot address. OT environments comprise industrial control systems (ICS) like Supervisory Control and Data Acquisition (SCADA) systems, Distributed Control Systems (DCS), and Programmable Logic Controllers (PLCs), which manage and control physical processes in sectors such as manufacturing, energy, and water treatment. Cyber resilience, in this context, is the ability of an OT system or organization to anticipate, withstand, recover from, and adapt to adverse cyber events, minimizing their impact on critical operations. Physical security measures encompass controls designed to protect personnel, hardware, and data from physical threats and unauthorized access, including fences, locks, surveillance cameras, alarm systems, and environmental controls. One fundamental reason for this criticality is that physical access often bypasses logical cybersecurity defenses. An attacker with unauthorized physical access to a....