Operational technology (OT) security is the practice of protecting the hardware and software that control physical processes – things like power grids, water treatment plants, and factory production lines.
If you’ve ever seen Die Hard 4, you’ll know how dangerous a potential cyber-attack against our critical infrastructure is. So much so that John McClane is called up to stop the attack. With solid OT security systems in place, we won’t need John McClane’s help – the systems will already be safe and protected from outside threats.
Why OT Security Matters Now
For most of its history, operational technology existed in isolation. Industrial systems were purpose-built, ran proprietary protocols, and had no internet connection, making cyber threats someone else’s problem.
The digital age changed that. As organisations connected their OT systems to corporate networks, cloud platforms, and third-party services, the attack surface expanded. For attackers, this meant looking beyond data to target the systems that control real-world physical processes. The consequences of a successful attack would be categorically different from an IT breach.
Where OT Security Is Front and Centre
Power Grids
The electricity network is one of the most critical OT environments in the UK. Substations, generation assets, and distribution systems all run on industrial control systems. A successful cyberattack on the grid doesn’t just disrupt operations; it can cause cascading failures across regions. OT security teams working in energy focus on protecting the SCADA systems and PLCs that keep the lights on, often under strict regulatory frameworks including the Network and Information Systems (NIS) Regulations.
Water Treatment
Water treatment plants use automated systems to monitor and adjust chemical dosing and filtration, both crucial for public access to safe water. To keep the supply consistent, these systems were built for reliability and not to protect against network-connected cyber threats. The UK has thousands of supply zones; each one is a potential target.
Manufacturing
Production lines in automotive, pharmaceutical, and food manufacturing rely on PLCs and DCS systems to operate with precision. Downtime isn’t just expensive; in some industries it’s catastrophic. OT security in manufacturing means protecting those systems without disrupting the availability that operations teams depend on. That tension between security and uptime is a defining challenge in the field.
OT Security Is Not IT Security
We understand that OT is not IT with a different name. And this distinction matters more than it sounds.
IT security is built around three priorities: confidentiality, integrity, and availability – in that order. OT security inverts them. Availability comes first, always. You cannot patch a running turbine or take a production line offline the same way you can a server.
IT security professionals who move into OT discover quickly that the tools, protocols, and risk models don’t translate directly. Legacy systems running outdated firmware are common. Proprietary industrial protocols that standard monitoring tools can’t read are the norm. The knowledge required to operate effectively in an OT environment is genuinely different. This is why finding the right people for these roles is harder than it looks.
OT Security Recruitment Requires a Different Approach
The pool of professionals who combine industrial operations knowledge with cybersecurity expertise is genuinely small. Demand is outpacing supply, and the candidate pool is exceptionally specialised. Considering the threat landscape grows more sophisticated each year, it’s important to work with a recruitment partner that understands the nuance of the industry.
Knowing what makes a strong OT security hire – the certifications that matter, the sectors that are hiring, the experience that actually transfers – is not something a generalist recruiter can fake. It requires deep familiarity with the field.
Frequently Asked Questions
Is OT security the same as ICS security?
The terms are closely related but not identical. ICS (Industrial Control System) security refers specifically to securing the control systems – PLCs, SCADA, DCS – used to manage industrial processes. OT security is the broader category: it covers ICS but also includes other operational hardware and software that doesn’t fit neatly into the ICS label. In practice, the two terms are often used interchangeably in job descriptions and industry conversation.
What is SCADA and why does it matter for security?
SCADA stands for Supervisory Control and Data Acquisition. It’s a system used to remotely monitor and control industrial equipment across wide geographic areas: electricity networks, pipelines, water distribution. SCADA matters for security because it sits at the intersection of physical infrastructure and network connectivity. A compromised SCADA system gives an attacker visibility into, and potentially control over, the physical processes it manages.
Why can’t you just apply IT security tools and practices to OT?
Several reasons. First, OT systems prioritise availability over everything else; you cannot simply take a production line or a water treatment plant offline to run a patch. Second, many OT systems run on legacy hardware and proprietary protocols that IT security tools weren’t built to monitor or analyse. Third, the risk model is different: an IT breach typically means data loss; an OT breach can mean physical damage, production failure, or public safety consequences. IT security expertise is valuable in OT, but it doesn’t transfer wholesale.
Which industries rely most heavily on OT security?
Any industry that uses automated systems to control physical processes. In practice, the highest-demand sectors in the UK are energy (power generation and distribution), water and wastewater, oil and gas, manufacturing, transport, and defence. These sectors are also subject to the most stringent regulatory requirements under frameworks like the NIS Regulations and, increasingly, the UK Cyber Security and Resilience Bill.
What qualifications do OT security professionals typically hold?
The most widely recognised certification in the field is the GICSP (Global Industrial Cyber Security Professional), administered by GIAC/SANS. For roles with an architecture or consultancy focus, IEC 62443 certification is highly valued. Many practitioners also come from engineering backgrounds — having hands-on experience with the industrial systems they’re securing is often as important as formal cybersecurity credentials. Our glossary of OT security terms is a useful starting point if you’re new to the field.
Ready to talk?
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About the author
Ben Griffiths is one of the founders of Paradigm Tech. As a specialist in IT and cybersecurity, he understands the nuance of placing the right people in organisations where IT and OT converge. Together with his partner, Charlie, they started Paradigm Tech to only focus on OT recruitment. This singular focus enables them to build a narrow but deep network of candidates with the correct certifications and hands-on experience. Connect with Ben on LinkedIn.