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OT Security: Securing Industrial Control Systems
Comprehensive guide to protecting ICS, SCADA, and DCS environments from cyber threats. Covers IEC 62443, Purdue Model segmentation, and IT/OT convergence strategies.
Resources
Comprehensive guide to protecting ICS, SCADA, and DCS environments from cyber threats. Covers IEC 62443, Purdue Model segmentation, and IT/OT convergence strategies.
Free Security Guide
22 Pages
5 Sectors
02
Risk Framework
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Purdue Model and IEC 62443 security zones and conduits explained
IT/OT convergence risk assessment framework with practical checklists
ICS protocol security: Modbus, DNP3, OPC UA, and BACnet threat vectors
Network segmentation strategies for SCADA and DCS environments
Incident response playbook adapted for operational technology environments
Compliance mapping: NIST CSF, IEC 62443, NERC CIP, and Indian NCIIPC guidelines
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Industry-specific threat landscapes and security recommendations.
Key threats: SCADA attacks, grid disruption, smart meter compromise
Key threats: PLC manipulation, production sabotage, IP theft via OT
Key threats: Pipeline SCADA compromise, safety system override, remote access abuse
Key threats: Signaling system attacks, fleet management compromise, port systems
Key threats: Chemical dosing manipulation, pump control compromise, SCADA exploits
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OT (Operational Technology) Security protects industrial control systems (ICS), SCADA systems, PLCs, and other operational devices that manage physical processes. Unlike IT security, OT security must prioritize availability and safety over confidentiality. According to CISA, OT attacks increased by 87% in 2025, with critical infrastructure being the primary target.
OT environments have unique constraints: legacy systems that can't be patched, 24/7 uptime requirements, safety implications of system failures, proprietary protocols (Modbus, DNP3), and 15-25 year equipment lifecycles. NIST SP 800-82 provides the foundational framework for addressing these differences. A failed OT security control can result in physical harm, environmental damage, or production shutdown-unlike IT where the impact is typically data loss.
What is the IEC 62443 standard?
IEC 62443 is the international standard for industrial automation and control system (IACS) security. It defines security levels (SL 1-4), zones, and conduits for network segmentation, and provides requirements for both asset owners and system integrators. The standard is increasingly required by critical infrastructure regulators worldwide.
Start with asset discovery and network visibility-most organizations don't have complete inventories of their OT assets. Then implement network segmentation between IT and OT using DMZ architecture (Purdue Model Level 3.5), deploy passive monitoring that doesn't disrupt operations, and establish OT-specific incident response procedures. This guide provides a phased roadmap.
Yes. The guide includes coverage of NCIIPC (National Critical Information Infrastructure Protection Centre) guidelines, sectoral CERT requirements (CERT-In), and India-specific regulatory frameworks for power, oil & gas, and transportation sectors. It addresses data localization requirements and indigenous technology considerations.
The guide covers OT-specific security tools including Claroty, Nozomi Networks, Dragos, and Fortinet OT Security for asset discovery and threat detection. It also addresses industrial-grade firewalls, unidirectional security gateways (data diodes), and secure remote access solutions designed for operational environments.
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