OT security · Industrial and critical infrastructure
Testing industrial systems without stopping the line.
Protocol-aware testing for environments where availability is the priority and a careless scan can halt a process. Most of the value comes from passive analysis and segmentation review.
Recon · Why it matters
In OT, the test itself is the biggest risk.
Point a standard scanner at a PLC and you can halt a process, trip a safety system, or damage equipment that takes months to replace. Industrial testing has to be deliberately conservative, which is why we start passive and treat every active step as something that needs your process engineers in the room.
Coverage · What we test
What is in scope.
01
Architecture and segmentation
The boundary between IT and OT, remote access paths, and whether the model on the diagram matches the cabling.
02
Passive network analysis
Traffic capture and protocol analysis that carries no risk to the process, and usually finds more than active testing would.
03
Protocol-aware testing
Modbus, DNP3, S7, OPC UA and the rest, tested with tooling that understands them, in windows you approve.
04
Remote access and supply chain
Vendor connections, jump hosts, and the engineering laptops that move between both networks.
Execution · How we work
How the engagement runs.
Step 01
Safety first, always
Every action is agreed in advance with your process engineers. Where there is doubt about impact, we do not do it.
Step 02
Start passive
Capture and analysis before anything active. On many sites this alone answers the important questions.
Step 03
Test in agreed windows
Active work happens during planned downtime or on an offline replica, with your team present and stop authority in the room.
Step 04
Report for both audiences
Findings operations and IT can both act on, because in OT the fix usually needs both.
Debrief · What you get
What lands on your desk.
Every engagement ends with something your engineers can act on and your auditors can accept.
- Segmentation assessment showing the real boundary between IT and OT, not the intended one
- Asset and protocol inventory built from observed traffic
- Prioritised findings weighted by process impact as well as security impact
- Remediation plan that accounts for maintenance windows and equipment that cannot be patched
Questions · Straight answers
Common questions.
Will testing disrupt production?
That is the constraint we design around. Most of the work is passive, and anything active happens in a window you approve with your engineers present.
Can you test legacy equipment that cannot be patched?
Yes, and it is common. Where a device cannot be fixed, the answer is usually compensating controls and segmentation, which is what the report focuses on.
Need this scoped? Let's talk.
Tell us what you need tested and when. A senior tester reads every request and replies within an hour with scope, timing and price.
Reply within an hour · NDA on request · Scoped by a senior tester, not sales