---
title: Secure OT Endpoints with OTAC Trusted Access Gateway—No Legacy Device Replacement
description: In traditional OT environments, PLC authentication processes are exposed to serious security risks. Access to PLCs is often protected by static, hard-coded passwords—or, in some cases, no authentication at all.
image: https://blog.ssenstone.com/hubfs/2026-01-16%20115310.jpg
---

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# Secure OT Endpoints with OTAC Trusted Access Gateway—No Legacy Device Replacement

[![Picture of SSenStone](https://blog.ssenstone.com/hubfs/SSenStone_November2021/images/emblem.svg)  SSenStone ](https://blog.ssenstone.com/en/video/author/ssenstone)

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# SSenStone | Secure OT Endpoints with OTAC Trusted Access Gateway—No Legacy Device Replacement

In traditional OT environments, PLC authentication processes are exposed to serious security risks. Access to PLCs is often protected by static, hard-coded passwords—or, in some cases, no authentication at all. These legacy authentication methods allow unauthorized users to access critical control systems, creating severe vulnerabilities in OT environments.

SSenStone’s OTAC Trusted Access Gateway (TAG) enhances authentication and access control for OT devices and systems without replacing legacy control and monitoring equipment or requiring vendor-side modifications.

TAG introduces a new paradigm for OT security, enabling infrastructure operators and enterprises to build and control OT security independently, rather than relying on manufacturer-dependent security models.

Upgrade authentication for PLC, HMI, DCS, RTU, and SCADA systems with OTAC Trusted Access Gateway.

Move beyond vendor-dependent security—and take full control of your OT security strategy.

 

 

 

 

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[![Picture of SSenStone](https://blog.ssenstone.com/hubfs/SSenStone_November2021/images/emblem.svg)  SSenStone ](https://blog.ssenstone.com/en/video/author/ssenstone)  Mar 17, 2022 4:23:00 PM

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