OT & ICS Security. Secure the plant without stopping it.
Operational technology was built for uptime and safety, then connected to IT for data it was never hardened to share. We secure that boundary the way the plant actually runs: visibility first, passive by default, and gated on safety.
A controller that has run a production line for fifteen years cannot be patched on a Tuesday, and an active scan can knock it offline. OT security is a safety and uptime problem first, and a cyber problem second.
Plants run legacy protocols, flat networks, and devices with decades of service life. Connecting them to IT opened up data and remote support, and it also opened a path attackers now use. The answer is a method built for the floor: see everything passively, separate IT from OT cleanly, and watch the protocols that actually run the process.
One view of the plant, from the boardroom to the bolt
We map your environment to the Purdue levels, then apply the right control at each one. IT at the top, the process at the bottom, and a brokered boundary that keeps them apart.
Enterprise network
ERP, email, internet, corporate apps
Site business systems
MES, scheduling, historians, reporting
Industrial DMZ
Data brokers, jump hosts, patch and update servers
Site operations
Control room, engineering workstations, local historian
Supervisory control
SCADA servers and HMI stations
Basic control
PLCs, RTUs, and dedicated controllers
Physical process
Sensors, actuators, and the equipment itself
Safe by design, every step
The method exists to protect production. These four rules govern everything we do inside an OT environment.
Passive first
We learn the environment by listening to traffic, with no active scanning of fragile devices until you approve it.
Safety gated
Any action that could touch a live process waits for plant sign-off and a maintenance window. Safety holds the veto.
No rip and replace
We work with the equipment you have, adding visibility and segmentation around it instead of forcing a forklift upgrade.
Change controlled
Every change runs through your management of change process, documented and reversible, with operations in the loop.
Built for operational environments
The protocols and constraints differ by industry. The method holds across them.
Aligned to the standards that govern you
- IEC 62443Zones, conduits, and security levels for industrial automation and control systems.
- NIST SP 800-82Guidance for securing operational technology and control systems.
- NERC CIPCritical infrastructure protection for the bulk electric system.
- NIS2Resilience obligations for essential and important entities across the EU.
Where OT security sits in VIGILE
Identify the OT estate, Guard the boundary
OT work runs through the Identify and Guard motions of VIGILE, mapping every asset on the floor and then hardening the IT/OT boundary around it. Monitoring feeds the iTDC so the SOC sees the plant alongside everything else.
See how VIGILE works ›Top 10 questions, frequently asked
No. We start passively, learning the environment from a span or tap of network traffic with no active probing of devices. Anything more intrusive waits for your approval and a maintenance window. Protecting uptime and safety is the first rule of the engagement.
Yes, and that is the normal starting point. Much of OT runs on equipment that cannot be patched on a modern cycle. We add visibility and segmentation around those devices, so a controller that cannot be patched is still isolated, monitored, and protected from the paths an attacker would use to reach it.
We use an industrial DMZ. Systems that need plant data, such as historians and reporting, read it from brokers in the DMZ rather than reaching into the OT network directly. The data keeps flowing, and there is no straight path from a compromised laptop to a controller.
We monitor the control protocols that run the process, including Modbus, DNP3, EtherNet/IP, OPC UA, and Profinet, alongside standard traffic. Detection is protocol aware, so an unexpected logic change on a PLC or an out-of-pattern command stands out rather than hiding in the noise.
OT telemetry feeds the iTDC, the same operating core behind our Autonomous SOC. Security Analysts see plant alerts with the context to act, and any response that could touch the process runs through a Human-In-Loop gate with plant operations involved.
With passive discovery: listening to network traffic to map assets, protocols, and flows without touching a controller. The first deliverable is an asset and exposure map most plants have never had.
Engineers who know both industrial protocols and enterprise security, working with your plant engineers. Production constraints set the rules, and nothing runs without operations sign-off.
Continuous protocol-aware monitoring through the iTDC, anomaly detection tuned to your process, and response runbooks that respect the physical consequences of every action.
Safety instrumented systems are treated as off-limits for active testing. Their exposure is assessed passively, and any finding routes through your safety process, never around it.
By site and asset count, starting with a fixed-scope assessment per site. Monitoring runs as a managed service alongside your existing IT coverage.
Related services
Autonomous SOC
The iTDC that watches your OT telemetry alongside IT, around the clock.
Learn more ›ServiceContinuous Threat Exposure Management
Exposure prioritization extended across the OT attack surface.
Learn more ›ServiceIncident Response
Containment and recovery built for environments where safety comes first.
Learn more ›See your plant the way an attacker would
Book a session with a Principal Engineer. We start with a passive read of your environment and map it to the Purdue model, with no risk to production.