---
title: "Rising OT Security Threats: An Authentication Security Solution for PLC, HMI, and SCADA"
description: As cyber attacks targeting OT environments continue to rise, securing Industrial Control Systems (ICS)—including PLC, HMI, DCS, RTU, and SCADA—has become a critical priority. International standards such as IEC 62443 and NIS2 now explicitly require authentication-based access control and auditability tailored to OT environments.
image: https://blog.ssenstone.com/hubfs/2026-01-16%20120147.jpg
---
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# Rising OT Security Threats: An Authentication Security Solution for PLC, HMI, and SCADA
[ SSenStone ](https://blog.ssenstone.com/en/video/author/ssenstone)
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# SSenStone | Rising OT Security Threats: An Authentication Security Solution for PLC, HMI, and SCADA
As cyber attacks targeting OT environments continue to rise, securing Industrial Control Systems (ICS)—including PLC, HMI, DCS, RTU, and SCADA—has become a critical priority. International standards such as IEC 62443 and NIS2 now explicitly require authentication-based access control and auditability tailored to OT environments.
To address these challenges, SSenStone delivers three OT Authentication Solutions powered by its proprietary one-way dynamic authentication technology, OTAC.
OTAC generates one-time, dynamic authentication codes that are impossible to steal, reuse, or predict. Unauthorized commands are blocked *before* reaching OT devices such as PLCs, HMIs, and RTUs, and the technology operates reliably even in closed, low-bandwidth OT environments—all without replacing existing legacy equipment.
**✔️ OTAC Trusted Access Gateway (TAG)**
A gatekeeper at the OT network edge that verifies every access attempt—enabling access control and audit logging without modifying legacy devices.
**✔️ Endpoint OTAC**
Authentication embedded directly into PLC, HMI, RTU, DCS, and SCADA devices—untrusted users and commands are blocked immediately at the device level.
**✔️ OTAC Auth MFA**
An OT-optimized MFA solution that prevents access even with stolen credentials—delivering strong yet field-friendly user authentication.
Transform your OT security with SSenStone—simpler, safer, and built for a resilient, future-ready industrial environment.
### Comments
## Related Posts
[Read more
](https://blog.ssenstone.com/en/video/demo-otac-trusted-access-gatewaytag)
[OTAC](https://blog.ssenstone.com/en/video/tag/otac) [Video](https://blog.ssenstone.com/en/video/tag/video) [PLC](https://blog.ssenstone.com/en/video/tag/plc) [OTsecurity](https://blog.ssenstone.com/en/video/tag/otsecurity)
## [OTAC Trusted Access Gateway(TAG) Demo Video](https://blog.ssenstone.com/en/video/demo-otac-trusted-access-gatewaytag)
# SSenStone | OT Auth Solutions-OTAC Trusted Access Gateway(TAG)
SSenStone’s OTAC Trusted Access Gateway (TAG) is...
[ SSenStone ](https://blog.ssenstone.com/en/video/author/ssenstone) Jan 16, 2026 11:47:35 AM
[Read more
](https://blog.ssenstone.com/en/video/secure-ot-endpoints-with-otac-trusted-access-gateway-no-legacy-device-replacement)
[OTAC](https://blog.ssenstone.com/en/video/tag/otac) [Video](https://blog.ssenstone.com/en/video/tag/video) [PLC](https://blog.ssenstone.com/en/video/tag/plc) [OTsecurity](https://blog.ssenstone.com/en/video/tag/otsecurity)
## [Secure OT Endpoints with OTAC Trusted Access Gateway—No Legacy Device Replacement](https://blog.ssenstone.com/en/video/secure-ot-endpoints-with-otac-trusted-access-gateway-no-legacy-device-replacement)
# SSenStone | Secure OT Endpoints with OTAC Trusted Access Gateway—No Legacy Device Replacement
In traditional OT...
[ SSenStone ](https://blog.ssenstone.com/en/video/author/ssenstone) Jan 16, 2026 11:54:52 AM
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