# IoT and OT Security: Protecting Operational Technology from Cyber Threats
Industrial systems once operated in isolation. Factory floors ran independently from corporate networks. Control systems communicated on proprietary protocols. Air gaps provided security through obscurity.
Digital transformation changed everything. Operational technology (OT) connects to IT networks for monitoring and optimisation. Industrial IoT sensors proliferate. Cloud analytics process operational data. The air gap disappeared.
Attackers followed the convergence. Attacks on industrial control systems can disrupt physical processes. Ransomware halts production lines. Compromised PLCs cause equipment damage. The stakes extend beyond data to physical safety.
## Understanding the OT Environment
OT differs from IT in ways that affect security.
**Availability primacy** trumps confidentiality. Production systems must run continuously. Planned downtime is scheduled months ahead. Unplanned downtime costs enormously. Security cannot disrupt operations.
**Long lifecycles** mean legacy technology. Control systems run for decades. Windows XP still controls production lines. Patching risks operational disruption. Technical debt accumulates.
**Safety implications** raise stakes. Industrial processes involve physical hazards. Compromised safety systems endanger lives. Security failures have consequences beyond data.
**Proprietary protocols** limit visibility. Industrial protocols lack security features. Modbus, DNP3, and others designed before cybersecurity mattered. Monitoring requires specialised tools.
## Security Approaches
Protecting OT requires adapted strategies.
**Network segmentation** isolates OT from IT. Purdue model defines zones and conduits. Firewalls control inter-zone traffic. Compromise in IT does not automatically reach OT.
**Monitoring for OT** uses specialised tools. Industrial protocol understanding enables detection. Baseline normal process behaviour. Alert on anomalies suggesting manipulation.
**Secure remote access** enables maintenance safely. Jump servers mediate access. Session recording provides audit trail. Multi-factor authentication required.
**Asset inventory** identifies what exists. Many organisations do not know all their OT devices. Discovery must be passive to avoid disruption. Inventory enables risk assessment.
## Implementation Considerations
OT security requires patience and pragmatism.
**Engage operations teams** as partners. Security cannot impose controls that disrupt production. Collaborative approach builds support. Understand operational constraints.
**Risk-based prioritisation** focuses effort. Not everything can be secured immediately. Identify highest risk systems. Address them first.
**Compensating controls** address unpatchable systems. When patching is impossible, other controls mitigate risk. Network isolation. Enhanced monitoring. Application whitelisting.
If your organisation needs help securing industrial control systems or IoT deployments, contact us through our contact page.