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A simple way to compare OT and IT is this: IT values data integrity, confidentiality, and availability. OT values process uptime, safety, and reliability.
IT is ubiquitous in an organization and used by nearly every employee, in every cost center. Therefore, IT security focuses on protecting data from unauthorized access or modification, with an emphasis on role-based access and training users, the weakest link, in safe cybersecurity practices.
OT assets and networks typically manage and control the crown jewels that drive revenue for an organization (or provide essential public services), often autonomously. If OT fails or is attacked, the stakes are higher than with IT, especially for critical infrastructure. Therefore, OT security involves ensuring the safe, reliable operation of physical processes.
IT security, also called information technology security, encompasses the tools, policies, and practices that protect digital systems, networks, data, and software from unauthorized access, theft, or disruption. Its core framework is the CIA triad: confidentiality, integrity, and availability. Common assets under IT security's scope include servers, workstations, cloud environments, databases, and enterprise software.
OT security, or operational technology security, focuses on protecting the hardware and software that monitor and control physical processes and industrial equipment. This includes industrial control systems (ICS) such as SCADA systems, programmable logic controllers (PLCs), and distributed control systems (DCS), along with the sensors and actuators connected to them. In the context of OT vs. IT security, the clearest distinction is that IT protects information while OT protects physical operations. In many industries, OT failures carry consequences that reach far beyond financial loss, including threats to worker safety and public infrastructure.
Protecting OT assets and networks has many challenges compared to IT cybersecurity practices, which track closely to the differences between OT and IT systems themselves.
1. Billions vs. millions
The sheer volume and diversity of OT and IoT devices make them harder to manage than IT devices. Moreover, every component in an OT network is part of a larger process in a very distributed environment. If a machine has a problem, you must immediately learn what it depends on and what is depending on it.
2. Harder to protect
Historically, OT networks were “air-gapped” – with no connectivity to the internet or enterprise IT networks, cyber threats weren’t a concern. Those days are long gone, but too often cybersecurity in OT environments is still an afterthought. Thanks to industrial digitalization, today’s production environments include hundreds of interconnected digital systems that improve efficiency but also introduce new risks. Many OT devices are unmanaged and can’t be patched like IT computers and servers. Where patching is possible, it can’t be automated. With some exceptions, threat detection relies on deep packet inspection and behavior-based anomaly detection techniques specifically designed for OT/ICS environments.
3. Anomaly detection vs. cyber threat detection
Ransomware attacks make headlines, but day-to-day network or process misconfigurations, operational errors, resource usage spikes and other anomalies are far more likely to threaten OT environments than outside attacks. An anomaly is anything that diverges from baseline performance. That could be unstable process values, incorrect process measurements and misconfigurations that could lead to malfunction.
4. Ephemeral data
Data moving through OT assets and processes (such as process values) is only relevant for an instant, and there might be millions of these data points per minute. Therefore, OT cybersecurity focuses less on data exfiltration and more on ensuring that data only moves between authorized devices and is current in every instant.
5. Longer equipment lifecycles
Most IT has a short lifecycle, with built-in obsolescence. Software is sunsetted or undergoes a major upgrade every few years, and hardware must be frequently replaced. Meanwhile, OT generally has a long lifecycle, in some cases up to several decades. Devices such as PLCs are often purpose-built for rugged production environments and built to last. Many OT devices still rely on legacy technology that is “insecure by design,” with well-documented vulnerabilities that too often remain unpatched. And it can take years for factory-authorized and site acceptance testing to occur, so small tweaks are not encouraged.
6. Continuous operation
Some OT systems (and their components) run continuously for years, with short windows for scheduled maintenance. Continuous operations help ensure safety and reliability, as downtime can lead to critical failures in industrial environments. Patches (if available) and other updates are infrequent and must be scheduled during narrow maintenance windows.
7. Unique operating systems and protocols
IT uses standard operating systems and communicates using standard protocols. Many OT devices have proprietary operating systems specific to their use. OT systems also use hundreds of protocols to communicate, many of them industry-specific and inherently insecure. These protocols are tailored for real-time monitoring and control of physical processes and devices, prioritizing reliability, deterministic response times and resilience over speed and flexibility. Proprietary protocols like Modbus or Profibus that must be carefully analyzed using deep packet inspection (DPI) to identify suspicious or anomalous behavior. IT intrusion detection systems (IDS) and endpoint detection and response systems (EDRs) don't understand industrial protocols, so they can't detect OT-focused threats. At best they would be ineffective; at worst they could consume too many resources or break something.
8. Insecure remote access
On any given day, manufacturers may have dozens of third-party technicians logging in remotely to monitor production and troubleshoot equipment, often using their own remote access tools. Lax use of weak credentials and default passwords leaves companies open to attack via remote code execution.
9. Autonomous devices
Especially for unmanned equipment, default passwords may never get changed, making it easy for bad actors to hack them, and multi-factor authentication (MFA) is impractical. Instead, continuous monitoring is used to authenticate devices and ensure the integrity of communication between devices.
10. More stringent segmentation
Segmentation is an essential compensating control to limit communications and protect devices that can be remediated infrequently if at all. To isolate industrial crown jewels and prevent cyber incidents on IT networks from moving laterally to OT networks, industrial environments make use of secure zones and conduits that control and monitor traffic between segments.
Despite their differences, IT and OT security share a number of foundational principles that make collaboration between the two disciplines both logical and necessary. Both rely on network visibility as a baseline requirement; you cannot protect what you cannot see. Both use risk management frameworks to prioritize threats and allocate resources. Firewalls, access control policies, and incident response planning are common ground across IT and OT security programs.
Regulatory compliance is also a shared concern: standards such as IEC 62443 and NIST SP 800-82 apply specifically to industrial environments, while frameworks like NIST CSF provide guidance applicable to both. Recognizing this common ground is often the first step toward building a unified IT/OT security strategy that protects the full enterprise.
Compliance obligations vary significantly between IT and OT environments, but both face growing regulatory pressure as threats to critical infrastructure intensify. In OT, sector-specific frameworks such as NERC CIP for energy, IEC 62443 for industrial automation, and NIST SP 800-82 for industrial control systems set requirements for asset visibility, access control, and incident response.
IT environments typically fall under broader mandates, including SOC 2, ISO 27001, HIPAA, and GDPR, depending on industry and geography. As IT and OT security programs converge under a single CISO, organizations must reconcile these overlapping and sometimes conflicting compliance frameworks. The most effective approach treats compliance not as a ceiling but as a floor, using it as a starting point for a more mature and comprehensive IT/OT security posture.
Understanding cybersecurity risk, introducing security best practices and creating a culture of awareness in industrial settings are major cultural changes. For example, getting OT engineers to accept cybersecurity risk mitigation as scheduled maintenance requires a shift in thinking. As CISOs embrace enterprise risk management and OT increasingly comes under their authority, this shift must happen.
Despite initial skepticism, OT operators derive many benefits from continuous asset and network monitoring. This practice collects a wealth of information about the assets and processes it monitors that is useful for detecting important changes, both anomalies from the baseline and cybersecurity threats. Moreover, once continuous monitoring begins, it typically exposes longstanding issues that operators never knew existed.
As soon as the Nozomi Networks platform is installed, network sensors start analyzing the ICS network traffic and building an interactive visualization of it. Operators and cybersecurity staff see the industrial network nodes visualized, often for the first time. They quickly perceive aspects of their environment that they weren’t previously aware of, and can easily drill down to find more information.
The addition of safe, non-disruptive endpoint sensors purpose-built for OT assets provides another layer of valuable information. Operators can see not just configuration changes and anomalies but also who’s logged onto a device, what other devices it’s communicating with and what protocols it’s using. Two big wins are visibility into East-West traffic at lower Purdue levels and unauthorized USB connections.
Merged IT/OT security operations centers (SOCs) are where the two cultures really come to a head. They are gaining popularity for obvious reasons such as central CISO oversight, IT/OT convergence, improved response times and, of course, cost savings. Rather than a merged SOC, however, more often what you see is the traditional IT SOC team providing a service to a new customer, the OT business unit. Frequently what plays out is a textbook example of the service provider not understanding their customer. A major knowledge transfer needs to occur but doesn’t.
A mature IT and OT security program does not treat the two disciplines as separate silos. It builds a layered architecture that accounts for the distinct requirements of each environment while enabling the visibility and coordination needed to respond to threats that span both. Core elements include network segmentation with well-governed conduits between zones, passive monitoring tools purpose-built for OT protocols, and a unified asset inventory that captures both IT devices and operational technology assets like PLCs, remote terminal units (RTUs), and IIoT sensors.
Access control is another pillar that spans both environments. On the IT side, zero trust architecture and MFA are increasingly standard. On the OT side, where MFA is often impractical for autonomous or legacy devices, compensating controls such as behavioral monitoring, strict network segmentation, and session recording for remote access fill the gap. Organizations that take a holistic view of it OT security, addressing both environments under a common governance framework while respecting their operational differences, are far better positioned to withstand the increasingly sophisticated threats targeting critical infrastructure today.
The challenge of unifying IT and OT security is real, but it is also one of the most important investments an industrial organization can make. Threat actors increasingly exploit the boundary between IT and OT as an entry point, using compromised enterprise credentials or supply chain access to reach operational systems that were never designed to withstand direct attacks. A resilient security posture requires more than tools;, it requires shared visibility, defined escalation paths, and teams on both sides of the IT/OT divide who understand each other's environments and constraints.
This is where a purpose-built platform and the right partner ecosystem make a decisive difference. Wherever you are, whatever your unique cybersecurity vision, you can rely on our global ecosystem of Nozomi Networks’ certified security and engineering professionals to deliver high-valuehigh value cybersecurity solutions that are customized to fit your exact needs. From in-depth OT/IoT network assessments with solution design, deployment, tuning, and support to complete managed platform, detection, operational analytics, and response services, we support your organization with a world of expertise. Whether you’ are just beginning to align your IT and OT security programs or looking to mature a converged SOC, Nozomi Networks provides the visibility, intelligence, and support to protect what matters most:, your people, your processes, and your operations.
Ready to close the gap between your IT and OT security programs? Contact us to connect with a Nozomi Networks expert.
