--- title: "OT vs IT Security: The Real Differences That Matter" description: "How OT security differs from IT security: priorities, asset lifespans, change control, patching, monitoring, incident response and governance, and where IT…" lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "@id": "https://fire-vault.com/#organization", "name": "Firevault", "legalName": "Firevault Limited", "url": "https://fire-vault.com", "logo": { "@type": "ImageObject", "url": "https://fire-vault.com/logo.png", "width": 200, "height": 60 }, "foundingDate": "2025-03", "description": "Protect what matters with Offline Secure Storage and control what moves with Control by Firevault. 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OT security protects industrial processes: it prioritises availability, then integrity, then confidentiality. That inversion changes almost every design decision, from patching to backup architecture." } }, { "@type": "Question", "name": "Is OT security part of cyber security?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. OT security is a specialist domain within cyber security focused on operational technology and industrial control systems. It shares concepts with IT security, but its priority ranking, lifecycle assumptions and network engineering constraints are different enough to be treated as a distinct discipline." } }, { "@type": "Question", "name": "Can IT security tools be used on OT networks?", "acceptedAnswer": { "@type": "Answer", "text": "Sometimes, but rarely unmodified. Standard IT tools often assume they can add latency, drop packets or install agents on hosts. OT networks run deterministic protocols where any of those actions can affect safety, so IT tooling deployed into OT usually needs passive collection and careful validation first." } }, { "@type": "Question", "name": "Why do OT and IT teams patch on different schedules?", "acceptedAnswer": { "@type": "Answer", "text": "IT systems typically refresh every three to five years and can often be patched automatically outside business hours. OT systems commonly run for fifteen to thirty years and require vendor validation and a planned maintenance window before a patch can be applied, because an untested change can affect the safety case for the process." } }, { "@type": "Question", "name": "Who owns OT security in most organisations?", "acceptedAnswer": { "@type": "Answer", "text": "Ownership varies. In some organisations OT security sits with plant or engineering leadership, in others it reports through the CISO alongside IT security. NCSC and NIST guidance both recommend clear, documented accountability rather than assuming existing IT security governance automatically extends to OT." } }, { "@type": "Question", "name": "Why can OT systems not be shut down like IT systems during an incident?", "acceptedAnswer": { "@type": "Answer", "text": "Shutting down an OT system is not always the safe option. Some processes must be brought down through a controlled sequence to avoid a hazardous condition, such as pressure, temperature or chemical reactions left unmanaged. Incident response in OT must weigh safety impact before availability impact, unlike the default IT response of isolating a host immediately." } }, { "@type": "Question", "name": "What is IT/OT convergence?", "acceptedAnswer": { "@type": "Answer", "text": "IT/OT convergence describes the growing connectivity between operational technology and enterprise IT, driven by demand for real-time production data, remote support and cloud analytics. It increases efficiency but also increases the attack surface, since a compromise in IT can now reach further into OT than it could when the two were fully separated." } }, { "@type": "Question", "name": "Does endpoint detection and response (EDR) work on OT?", "acceptedAnswer": { "@type": "Answer", "text": "Rarely without modification. Many OT devices cannot run a conventional EDR agent because of limited processing headroom, unsupported operating systems or vendor warranty restrictions. Passive network monitoring and asset inventory tools are more commonly used to gain visibility without touching the endpoint directly." } }, { "@type": "Question", "name": "Which IT security practices transfer safely to OT?", "acceptedAnswer": { "@type": "Answer", "text": "Asset inventory, network segmentation, least-privilege access, logging and offline backup of critical configuration all transfer well, with adaptation for OT constraints. Practices that assume continuous connectivity, automatic patching or automated isolation responses generally do not transfer without significant redesign." } }, { "@type": "Question", "name": "Where does Firevault fit between IT and OT security?", "acceptedAnswer": { "@type": "Answer", "text": "Firevault does not replace either discipline. Offline Secure Storage protects a verified, offline copy of OT gold data and recovery assets, and Firevault Control governs when a connection to that storage is permitted, so a restore point survives even if both the IT and OT networks are compromised." } } ] } ] --- Recent Breaches Breaches [2026 PowerSchool 62.4M records ](/learn/breaches)[2026 DISA Global Solutions 3.3M records ](/learn/breaches)[2026 Globe Life 850K records ](/learn/breaches)[2026 Lidl GB Customer contact data ](/learn/breaches)[2026 Asahi Group Production systems disrupted ](/learn/breaches)[2026 Kido International 8K records ](/learn/breaches)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](/learn/breaches)[2026 Jaguar Land Rover Production and IT systems disru... ](/learn/breaches)[2026 Peter Green Chilled Order and logistics data ](/learn/breaches)[2026 Adidas UK Customer contact details ](/learn/breaches)[2026 PowerSchool 62.4M records ](/learn/breaches)[2026 DISA Global Solutions 3.3M records ](/learn/breaches)[2026 Globe Life 850K records ](/learn/breaches)[2026 Lidl GB Customer contact data ](/learn/breaches)[2026 Asahi Group Production systems disrupted ](/learn/breaches)[2026 Kido International 8K records ](/learn/breaches)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](/learn/breaches)[2026 Jaguar Land Rover Production and IT systems disru... ](/learn/breaches)[2026 Peter Green Chilled Order and logistics data ](/learn/breaches)[2026 Adidas UK Customer contact details ](/learn/breaches) [View All →](/learn/breaches) [![Firevault - offline secure storage, physically disconnected from the internet](/assets/logo-color-DBVl0KCg.png)](/) Products Solutions [Why OSS](/why-oss) More [Help](/help)[Get started](/get-started) [Knowledge Vault](/learn/knowledge) Explainer OT and ICS security # OT vs IT Security: The Real Differences That Matter Same word, different discipline. Priorities, lifecycles, change control, monitoring and incident response all pull OT security away from the IT security playbook. ![Mark Fermor](/assets/mark-fermor-aWtKNSv7.jpg) Mark Fermor Director & Co-Founder, Firevault 4 November 2025 16 min read Share [](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Fot-vs-it-security)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Fot-vs-it-security&text=OT%20vs%20IT%20Security%3A%20The%20Real%20Differences%20That%20Matter%0A%0ASame%20word%2C%20different%20discipline.%20Priorities%2C%20lifecycles%2C%20change%20control%2C%20monitoring%20and%20incident%20response%20all%20pull%20OT%20security%20away%20from%20the%20IT%20security%20playbook.)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Ffire-vault.com%2Flearn%2Fot-vs-it-security)[](mailto:?subject=OT%20vs%20IT%20Security%3A%20The%20Real%20Differences%20That%20Matter&body=Same%20word%2C%20different%20discipline.%20Priorities%2C%20lifecycles%2C%20change%20control%2C%20monitoring%20and%20incident%20response%20all%20pull%20OT%20security%20away%20from%20the%20IT%20security%20playbook.%0A%0Ahttps%3A%2F%2Ffire-vault.com%2Flearn%2Fot-vs-it-security) ![OT versus IT security compared: a plant control room alongside a corporate IT network operations centre](/assets/explainer-ot-vs-it-security-n1CvHMkY.jpg) OT security and IT security share vocabulary but diverge on almost every practical decision, from patching to incident response. Written by Mark Fermor, Co-Founder, Firevault Technical review Firevault architecture team First published 4 November 2025 Last reviewed 27 August 2026 Review cycle At least annually, or following material changes to NIST, NCSC or ISO guidance. How we built this explainer: Firevault reviewed NIST SP 800-82 Revision 3, the ISA/IEC 62443 series and NCSC UK operational technology guidance, then compared their treatment of OT security against established IT security practice to identify where the two disciplines genuinely diverge and where IT tooling and process transfer safely. **On this page**[OT security vs IT security, an overview](#overview)[Priorities: availability vs confidentiality](#priorities)[Asset lifespans and change control](#lifespans)[Patching in IT compared with OT](#patching)[Endpoint tooling and its limits in OT](#endpoint-tooling)[Monitoring approaches](#monitoring)[Incident response differences](#incident-response)[Governance and who owns what](#governance)[Convergence pressures](#convergence)[Where IT practice transfers, and where it does not](#what-transfers)[How Firevault applies these principles](#firevault)[Sources and further reading](#sources) On this page 1. [OT security vs IT security, an overview](#overview) 2. [Priorities: availability vs confidentiality](#priorities) 3. [Asset lifespans and change control](#lifespans) 4. [Patching in IT compared with OT](#patching) 5. [Endpoint tooling and its limits in OT](#endpoint-tooling) 6. [Monitoring approaches](#monitoring) 7. [Incident response differences](#incident-response) 8. [Governance and who owns what](#governance) 9. [Convergence pressures](#convergence) 10. [Where IT practice transfers, and where it does not](#what-transfers) 11. [How Firevault applies these principles](#firevault) 12. [Sources and further reading](#sources) OT security and IT security are often described as though they were the same discipline applied to different equipment. They are not. Operational technology exists to control physical processes safely and continuously, while IT exists to process and protect information. That difference in purpose changes almost every practical decision: what gets patched and when, how systems are monitored, how an incident is handled, and who is accountable when something goes wrong. This explainer sets out the real differences between OT security and IT security, where the two disciplines are converging under commercial and technical pressure, and which IT security practices transfer safely into an OT environment and which do not. ## OT security vs IT security, an overview [NIST SP 800-82 Revision 3](https://csrc.nist.gov/pubs/sp/800/82/r3/final) frames OT security as a discipline that shares tools and terminology with IT security but must be adapted for environments where availability, safety and physical consequence take precedence over data confidentiality. The table below summarises the highest-level distinctions covered in this explainer. Area IT security OT security Top priority Confidentiality Availability Typical asset life 3 to 5 years 15 to 30 years Patch cadence Regular, often automated Planned maintenance windows Change control Continuous deployment common Formal change and safety review Incident response default Isolate the affected host Assess safety impact before any isolation A high-level comparison of IT security and OT security across the areas covered in this explainer. ## Priorities: availability vs confidentiality IT security commonly follows the confidentiality, integrity, availability ranking. OT security inverts this, placing availability first because the unavailability of a control system can mean loss of control over a physical process, which can create a safety event rather than a purely commercial one. IT security Confidentiality, integrity, availability - Protect sensitive data first - Integrity of records and transactions - Availability managed through redundancy OT security Availability, integrity, confidentiality - Keep the process running safely - Integrity of control logic and setpoints - Confidentiality is secondary, though still relevant The inverted priority ranking is the single biggest reason OT and IT security diverge in practice. ## Asset lifespans and change control IT hardware and operating systems typically refresh on a three to five year cycle, aligned with vendor support lifecycles. OT assets are commonly specified to run for fifteen to thirty years, often on operating systems that reached end of vendor support long before the equipment is retired. This longevity means OT change control is inherently more conservative. A change that would be routine in IT, such as installing a security update, requires engineering sign-off in OT because it may interact with control logic, timing or safety interlocks that were validated against the original, unpatched configuration. ## Patching in IT compared with OT Patch management is one of the clearest points of divergence. IT patching is frequent, often automated, and designed around minimising the window of exposure to a known vulnerability. OT patching is infrequent, manual, and designed around minimising the risk of an untested change disrupting a live process. IT Patch released, tested and deployed within days to weeks OT Vendor validation, safety review, then deployment tied to a planned outage Can take months, and some legacy assets may never be patched within their remaining service life. IT patch cycles and OT patch cycles pass through the same broad stages, but the OT cycle has additional safety and scheduling checkpoints. ## Endpoint tooling and its limits in OT Conventional endpoint detection and response (EDR) agents assume spare processing capacity, a supported operating system and the ability to take automated action such as quarantining a process or blocking network traffic. Many OT endpoints, particularly older PLCs, RTUs and embedded HMI devices, cannot meet any of those assumptions. Where EDR-style tooling is deployed in OT, it is typically limited to modern engineering workstations and servers rather than field controllers, and any automated response action is usually disabled or replaced with an alert to a human operator, consistent with the safety-first priority described above. ## Monitoring approaches IT monitoring commonly combines host-based agents with inline network security appliances. OT monitoring leans heavily on passive network taps and span ports, precisely because an inline device that fails or adds latency can itself interrupt a deterministic industrial protocol and create a safety issue. - IT: host agents, inline firewalls, SIEM correlation across cloud and on-premises systems - OT: passive network taps, protocol-aware sensors, asset inventory built from observed traffic - IT: automated blocking on detection is standard practice - OT: detection generally routes to a human decision before any blocking action is taken ## Incident response differences The default IT incident response instinct, isolate the affected host immediately, does not transfer safely to OT. A controller isolated mid-process can leave a valve, pump or safety system in an undefined state. OT incident response plans assess safety impact before availability impact, and any isolation or shutdown decision is made jointly with process engineering, not by the security team alone. IT default: isolate immediately Network Data - Automated containment on detection - Host taken offline within minutes - Business continuity plan invoked OT default: assess, then act deliberately Network Data - Safety and engineering assessment first - Controlled shutdown sequence if required - Recovery from verified gold data once safe In OT, disconnecting a compromised path is a deliberate, engineered decision, not an automatic response, because the safe state of the process must be considered first. ## Governance and who owns what In many organisations, IT security reports through a CISO with clear enterprise-wide authority. OT security ownership is more varied: it may sit with plant or engineering leadership, with a dedicated OT security function, or nominally under the CISO without matching operational authority on the plant floor. NCSC and NIST guidance both recommend documented, unambiguous accountability for OT security decisions, including who can authorise a change, who can approve an emergency isolation, and who owns the relationship with equipment vendors. Without this, IT and OT teams can each assume the other has covered a given risk. ## Convergence pressures Commercial pressure for real-time production data, predictive maintenance and remote vendor support is increasing connectivity between OT and enterprise IT. This IT/OT convergence brings genuine operational benefit, but it also means a compromise that starts in enterprise IT, such as a phishing-led ransomware attack, can reach further into OT than it could when the two networks were fully separated. Convergence therefore increases, rather than reduces, the need for the segmentation and recovery architecture described in the [Purdue Model explainer](/news/the-purdue-model-everything-you-need-to-know). ## Where IT practice transfers, and where it does not Not every IT security control needs reinventing for OT, and not every OT constraint is as absolute as it first appears. The following distinctions are a practical starting point. 1. Asset inventory. Transfers well. Knowing what is on the network is foundational to both disciplines. 2. Network segmentation. Transfers with adaptation. The principle is the same; the implementation must respect deterministic protocols and safety zones. 3. Least-privilege access. Transfers well, though OT access models must also account for vendor and third-party maintenance access. 4. Automatic patch deployment. Does not transfer. OT patching needs vendor validation and a planned window. 5. Automated containment on detection. Does not transfer without modification. OT response must weigh safety before availability. 6. Offline, verified recovery data. Transfers and strengthens both disciplines. A known good, disconnected copy protects IT and OT against the same class of destructive attack. ## How Firevault applies these principles Firevault sits at the point where OT and IT recovery planning genuinely converge: the need for a verified, offline copy of critical data that survives a compromise of either network. Offline Secure Storage® holds OT gold data, configurations and recovery assets, or IT backup data, in a state that is physically disconnected by default. Firevault Control governs when a connection is permitted, so the decision to open a data path is deliberate rather than automatic, in keeping with the safety-first approach described throughout this explainer, and consistent with the Disconnect to Protect® principle. This does not replace the segmentation, monitoring or incident response processes native to either discipline; it protects the recovery point both disciplines ultimately depend on. Key takeaway ## OT and IT security share a vocabulary, not a playbook The inverted priority ranking, decade-long asset lifespans and safety constraints in OT mean that most IT security defaults, from automatic patching to automated host isolation, cannot be applied unmodified. Effective OT security borrows the underlying principles of IT security, such as least privilege and network segmentation, while re-engineering how they are delivered. Recovery planning is one area where the two disciplines should converge rather than diverge. A verified, offline copy of critical configuration and data protects both estates against the same underlying threat: a network-based attack that reaches further and faster than either team expected. Questions ## Frequently Asked Questions Straight answers on how Offline Secure Storage® behaves in practice. ### What is the difference between IT and OT security? ### Is OT security part of cyber security? ### Can IT security tools be used on OT networks? ### Why do OT and IT teams patch on different schedules? ### Who owns OT security in most organisations? ### Why can OT systems not be shut down like IT systems during an incident? ### What is IT/OT convergence? ### Does endpoint detection and response (EDR) work on OT? ### Which IT security practices transfer safely to OT? ### Where does Firevault fit between IT and OT security? ## Sources and further reading - [NIST SP 800-82 Rev. 3, Guide to Operational Technology (OT) Security](https://csrc.nist.gov/pubs/sp/800/82/r3/final) Sets out how OT security priorities, architecture and controls differ from conventional IT security practice. - [ISA/IEC 62443 series](https://www.isa.org/standards-and-publications/isa-standards/isa-iec-62443-series-of-standards) Industrial automation and control systems security standards, including zones, conduits and security levels. - [NCSC, Operational Technology guidance collection](https://www.ncsc.gov.uk/collection/operational-technology) UK guidance on OT architecture, connectivity and the practical limits of applying IT controls to OT. - [CISA, Cross-Sector Cybersecurity Performance Goals](https://www.cisa.gov/cross-sector-cybersecurity-performance-goals) US guidance distinguishing baseline expectations for IT and OT/ICS environments. - [NIST CSF 2.0](https://www.nist.gov/cyberframework) Framework functions referenced by both IT and OT security programmes, applied differently in each context. Related Firevault guides [What is OT security?](/learn/what-is-ot-security) [The Purdue Model: everything you need to know](/news/the-purdue-model-everything-you-need-to-know) [Physical air gap for ransomware protection](/learn/physical-air-gap-ransomware-protection) [OT network segmentation explained](/learn/ot-network-segmentation) About the author ![Mark Fermor](/assets/mark-fermor-aWtKNSv7.jpg) ### Mark Fermor [](https://www.linkedin.com/in/mfermor) Director & Co-Founder Co-founder of Firevault, focused on offline secure storage and protecting individuals and businesses from fraud, fines, loss and damage. Speaker, owner and advisor. 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