“OT is not IT with a different name.”
It’s a line we use often, and it’s the shortest way to correct the most common misunderstanding in this space. IT security protects data. OT security protects the physical processes that keep power grids running, water safe to drink, and production lines moving.
The two disciplines share some vocabulary and procedures, but the priorities, the risks, and the people who do the work are genuinely different.
Where the Confusion Comes From
OT security isn’t a new discipline with industrial control systems having existed for decades, but regulation has only forced it into the mainstream conversation over the last five years. Frameworks like NIS2, the NIS CAF, and IEC 62443 have made OT security investment mandatory for a much wider range of organisations. That brought a wave of hiring and attention that didn’t exist before.
The result is a lot of people encountering the term “OT security” for the first time, and doing what most of us do with an unfamiliar concept: mapping it onto something familiar. For most people, that’s IT security. It’s an understandable shortcut, but it misses how industrially focused OT actually is.
In our experience, this stems from a lack of understanding. Although it has been around for decades, regulation has made it significantly more common in the last five years, so the majority of people are unaware of what the industry is really about.
People miss how industrially focused it is, and the fact you’re often required on-site, not just in an office or working from home.
Physical Risk vs Digital Risk
In IT security, the worst-case outcome is usually data loss or downtime, resulting in reputational damage.
In OT security, a breach can mean a pump fails, a safety interlock is disabled, or a piece of machinery keeps running when it shouldn’t. The systems being protected control physical reality, so the consequences of getting it wrong show up in the physical world.
Uptime First, Not Confidentiality First
IT security is generally built around the CIA triad: confidentiality, integrity, and availability, usually prioritised in that order. OT security flips it. Availability always comes first.
A factory that goes offline to patch a vulnerability can cost more in lost production than the vulnerability itself would ever cost to exploit, and in some environments, taking a system down to unsafe to risk. That single difference in priority shapes almost every decision an OT security professional makes, from patching schedules to how incidents get handled.
How Incident Response Differs
The instinct in IT security, when something looks wrong, is often to isolate and shut down. Pull the device off the network to stop the process and contain the damage.
In OT, that instinct can create a bigger problem than the one it’s solving. Cutting power to a control system mid-process isn’t a safe default; it can be the difference between a contained issue and a genuinely dangerous one. This means that OT incident response tends to be slower and more deliberate, built around keeping the physical process safe first and investigating second.
Legacy Systems Change Everything
A lot of the operational technology running critical infrastructure today was installed ten, twenty, even thirty years ago. It’s proprietary and built to run for decades rather than be regularly updated.
Many of these systems can’t be patched the way a laptop can; some can’t be patched at all without replacing the hardware, and taking them offline for maintenance has to be scheduled around production. OT security professionals have to work around these constraints rather than against them, and it requires foresight and planning over mere immediate problem-solving.
Why IT Security Professionals Sometimes Struggle in OT
None of this means IT security expertise doesn’t transfer. In fact, many OT security professionals had their start in IT, and that’s why the IT-to-OT pipeline is one of the most active sourcing channels in the market right now.
But the professionals who make the jump successfully are the ones who unlearn the instinct to prioritise confidentiality and speed above all else. They need to be comfortable that the job often means being on-site with engineers, not just at a desk with a SIEM dashboard. In other words, it’s more hands-on and practical, making the work more dynamic, but it can be jarring if you didn’t anticipate the shift.
Frequently Asked Questions
Is OT security just a subset of IT security?
No. OT security is its own discipline with a different priority order, different regulations (like IEC 62443), and different certifications (like GICSP). IT security tools and playbooks often don’t transfer directly because they weren’t designed with physical safety and system uptime as the first priority.
What does OT stand for in cyber security?
OT stands for operational technology — the hardware and software that monitors and controls physical devices and processes, such as manufacturing robots, power grids, and water treatment systems.
Why is availability more important than confidentiality in OT security?
Because taking an OT system offline can stop a physical process which can be more costly and, in some cases, more dangerous than the security issue being addressed.
Do OT security professionals need to work on industrial sites?
Often, yes. Unlike many IT security roles, OT security frequently requires being physically present on manufacturing floors, energy sites, or other industrial environments.
Can IT security experience transfer to OT security?
A good foundation, yes — particularly in areas like network security and risk and compliance. But the mindset shift is real, and most successful movers combine their IT background with OT-specific certifications like GICSP or ISA/IEC 62443.
Ready to talk?
At Paradigm Tech, OT security recruitment is all we do. Whether you’re looking for qualified OT security talent or searching for your next role in the field, we’d be glad to help.
About the author
Ben Griffiths is one of the founders of Paradigm Tech. As a specialist in IT and cyber security, 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.
