BY Standard & Regulation

Aligning Rail OT Security with IEC 62443-3-3

IEC 62443-3-3 provides a framework for securing industrial automation and control systems, focusing on system-level security requirements for zones and conduits. Applying this framework in rail OT environments requires adapting theory to safety-critical, long-lived systems.

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Challenges

The Main Challenges in Applying IEC 62443-3-3 in Rail

Defining zones and conduits is difficult without operational insight

Rail systems often evolve organically, making it hard to map boundaries and interactions accurately.

Security requirements must respect safety and certification constraints

Implementing controls cannot interfere with deterministic behavior or validated system configurations.

Assessment requires ongoing validation, not one-time design

IEC 62443-3-3 requires that security be maintained as systems evolve over time.

OUR Solutions

How CylusOne Supports IEC 62443-3-3 Alignment

Defining Security Zones and Conduits Based on Operational Reality

CylusOne supports the definition of security zones and conduits by mapping real operational communication between rail systems, ensuring zoning reflects how the network actually functions.

Validating Security Design Against Live System Behavior

CylusOne provides insight into whether system behavior aligns with intended design assumptions, helping teams validate that security requirements remain effective as environments evolve.

Supporting Ongoing Assessment of Zone and Control Effectiveness

CylusOne supports incident readiness by providing operational context that helps teams assess scope, impact, and escalation requirements within mandated timelines.

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