Existing systems. Modern security.
Overlay Technology
Rapid deployment
On-premise Equipment
The Challenge
The challenge: critical systems can’t move to the cloud, but still need Zero-Trust.
Factories, utilities, and defense networks rely on legacy and on-premise systems that must stay operational 24/7.
Yet these same systems are increasingly connected — to partners, remote teams, analytics tools, and cloud services.
Each new connection adds risk:
Flat networks mean one compromised device can expose an entire plant.
Firewalls and VPNs only secure the perimeter — not the internal flows between systems.
Cloud-based Zero-Trust solutions don’t work offline, in air-gapped networks, or on older industrial protocols.
Compliance standards like NIS 2, IEC 62443, and CMMC 2.0 demand segmentation, encryption, and full visibility that most legacy systems simply can’t provide.
For many operators, that means choosing between security and continuity.
Trout removes that trade-off.
Trout Secure Twin
The solution: a Zero-Trust overlay — deployed directly on-premise.
Trout delivers Zero-Trust as an overlay, not a rebuild.
Our plug-and-play appliances sit inside your network and create a secure layer over your existing infrastructure.
Every connection — whether between users, machines, or remote vendors — is authenticated, encrypted, and logged.
No downtime.
No rewiring.
No dependence on the cloud.
How it works
1. Overlay segmentation
Trout builds logical enclaves around your existing assets, from workstations and servers to PLCs and sensors.
Each enclave isolates traffic and enforces least-privilege access policies at the protocol level.
2. Identity-driven access
Access is verified for every user, machine, and process.
Rules can include role, time, origin, and device type — allowing granular control over human and machine-to-machine communication.
3. Local encryption and audit trail
All traffic through the overlay is encrypted and logged locally for full sovereignty and traceability — with automated reports aligned to CMMC 2.0 and IEC 62443.
4. Adaptive and scalable
The overlay grows with you: add new assets or plants without re-architecting your network.
Trout appliances interconnect seamlessly, forming a distributed, on-premise Zero-Trust fabric.
Explore Trout in action
A new model for on-premise security.
FAQ
About Zero-Trust Overlays for On-Premise and Legacy Systems
Related Resources
Implementing Zero Trust in Air-Gapped Networks
Secure your air-gapped OT networks with Zero Trust principles.
Zero Trust in OT: Why the Perimeter is Dead
Zero Trust replaces traditional perimeter defenses in OT environments
Beyond Purdue
A practical roadmap for securing modern industrial networks — without costly rebuilds.
Summary: Bringing Zero-Trust to the Physical World
For years, Zero-Trust has been framed as a cloud or enterprise IT concept — built for laptops, SaaS applications, and distributed teams.
But in factories, data centers, and defense networks, the story is different. Most of the critical systems that matter — controllers, sensors, servers, lab equipment, industrial PCs — still live on-premise. They’re reliable, proven, and often can’t be moved or replaced.
The challenge isn’t to migrate them.
It’s to secure them where they are.
That’s what Trout’s Zero-Trust overlay does. It extends the principles of identity-based access, segmentation, and encryption directly into environments that cloud solutions can’t reach. Instead of rebuilding networks or deploying dozens of firewalls, you can add a secure layer over what already works — protecting both legacy and modern assets alike.
The result is a network that finally behaves like it should:
Every connection is authenticated.
Every flow is encrypted.
Every access is logged and provable.
And every plant or facility remains autonomous, resilient, and compliant by design.
With Trout, Zero-Trust is no longer a distant goal or a multi-year transformation project.
It’s something you can deploy on-premise, this week — with no downtime, no cloud dependency, and no disruption to production.
Trout brings Zero-Trust to the physical edge of your organization — where security, continuity, and compliance meet.