How OT security works
Operational technology controls physical processes: power distribution, water treatment, production lines and building systems. These environments often use specialized protocols and equipment with long lifespans, and were designed for reliability rather than security, so many components lack authentication or encryption.
OT security therefore relies on visibility and isolation. Teams identify assets and traffic passively, segment control networks from corporate IT, restrict remote access, and monitor for abnormal commands, using methods that will not disrupt sensitive processes. Many incidents begin with a remote access path that was left open for vendor convenience.
Why it matters for Canadian organizations
Canada's energy, water, transportation and manufacturing sectors depend on OT. A cyber incident can halt production or affect public safety, not just expose data. The Canadian Centre for Cyber Security has published guidance on protecting industrial control systems.
As IT and OT converge, ransomware that starts in an office network can reach control systems. Critical infrastructure operators face growing regulatory attention in Canada, making documented OT risk management increasingly important. Safety systems must be considered carefully, since changes can have physical consequences.
How to defend against it
Build an accurate asset inventory, then separate OT from IT with firewalls and a demilitarized zone. Require multi-factor authentication and monitored jump hosts for remote access, and control removable media and vendor connections.
Where patching is impractical, use compensating controls such as virtual patching and tight allow-listing. Deploy OT-aware monitoring, rehearse incident response with operations staff, and keep tested backups of controller configurations. Review vendor remote access regularly, and require approval before each session begins. Operations and security teams should plan together so protections do not disrupt production.
Frequently asked questions
What is the difference between IT and OT security?
IT security prioritizes confidentiality of data, while OT security prioritizes availability and safety of physical processes. OT also involves legacy devices, proprietary protocols and limited downtime for patching. Safety and uptime usually take precedence over confidentiality.
What is SCADA?
SCADA stands for supervisory control and data acquisition. It is a system that gathers data from field devices and lets operators monitor and control industrial processes such as power grids or pipelines. Equipment may run for decades, so security must be added around it.
Can OT systems be patched like regular computers?
Often not easily. Patching may require downtime, vendor approval or testing, and some devices are unsupported. Organizations use segmentation, monitoring and compensating controls to reduce risk in the meantime. Cooperation between IT and engineering teams is essential for success.
Related service: Security consulting