What is the difference between IT and OT security?

IT security protects information: it prioritises confidentiality, then integrity, then availability. OT security protects industrial processes: it prioritises availability, then integrity, then confidentiality. The inversion changes almost every design decision, from how systems are patched to how backups are architected and restored.

Is OT security part of cyber security?

Yes. OT security is a specialist domain within cyber security that focuses on operational technology and industrial control systems. It shares tooling and concepts with IT security, but its priority ranking, lifecycle assumptions and network engineering constraints are different enough that it is treated as a distinct discipline.

Can IT security tools be used on OT networks?

Sometimes, but rarely as-is. Standard IT tools often assume they can add latency, drop packets or push agents to hosts. OT networks run deterministic protocols where any of those actions can affect safety. IT tools deployed into OT usually require passive collection, engineered network taps and careful validation.

Why is backup architecture different for OT?

Because recovery is a first order requirement, not a fallback. OT estates need a known good copy that can be restored quickly, often at a site with constrained bandwidth, and that survives when the enterprise domain has been compromised. That is exactly what a physical air gap like Firevault Offline Secure Storage provides, layered under whatever operational backup tooling is already in place.

Why OSS

OT vs IT
Security

Same word, different discipline. Four differences that decide how you segment, patch, monitor and recover on an industrial estate.

R5.2

Where they diverge

Four Differences That Change Every Decision

Priority ranking, lifecycle, network engineering and recovery all pull OT security away from the IT security playbook.

Availability vs confidentiality

Priority ranking is inverted

IT security ranks confidentiality first, then integrity, then availability. OT security inverts that: availability comes first because an unavailable plant is a safety event, then integrity of the process, then confidentiality. Every downstream decision, from patching to backup, follows from that inversion.

IT: confidentiality firstOT: availability firstSafety drives the ranking

OT kit outlives IT kit by an order of magnitude

Lifecycles are decades, not quarters

IT kit refreshes on a three to five year cycle. OT kit runs for fifteen, twenty or thirty years, on operating systems that were current when it was installed. That means unpatched systems, legacy protocols and a much larger attack surface for anything that reaches the plant floor.

OT lifecycles measured in decadesLegacy operating systemsCannot be patched on the IT cadence

Deterministic protocols, not best effort

Networks are engineered, not managed

OT networks run deterministic industrial protocols and are engineered for predictable timing and safety. Introducing an IT security control that adds latency or drops packets can trigger a safety event. This is why standard IT tooling often cannot be deployed inside an OT estate without careful redesign.

Deterministic industrial protocolsLatency is a safety concernIT tooling rarely fits as-is

Restore, not just detect

Recovery is a first order requirement

IT security invests heavily in detection and response because the outcome of a compromise is often data loss. OT security must invest in recovery because the outcome is production loss and potential safety impact. A verified, offline gold copy that can be restored quickly is the anchor of any credible OT recovery plan.

Detection is necessary but not sufficientRecovery drives designOffline gold copy is the anchor

Continue reading on the pillar guide and the definitional overview.

OT and ICS security pillar guide What is OT security Physical air gap for ransomware protection

OT vs IT Security, Common Questions

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OT vs ITSecurity