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As Web SCADA and cloud-hosted HMI adoption has grown, so has the attack surface that comes with it. The old assumption behind SCADA security — that anything inside the plant network perimeter can be trusted — has been steadily eroding as more systems are accessed remotely from laptops, tablets, and off-site engineering workstations. In response, zero trust architecture, long established in IT, is now being actively adapted for industrial control systems and reflected in updated ISA/IEC 62443 guidance and NIST's zero trust framework for OT environments.

In practice, zero trust for SCADA means replacing a single perimeter firewall and VPN with continuous, identity-based verification at every access point: every operator, engineer, and integration is authenticated and authorized for a specific system and session rather than trusted by virtue of network location. Micro-segmentation carves the network into smaller zones so that a compromised device or credential can't move laterally from an office network into control logic, and every access request is logged and evaluated rather than assumed safe once it's past the gate.

This shift matters more for browser-based and cloud-connected SCADA than for older thick-client systems, precisely because the whole appeal of Web SCADA is being reachable from more places and more devices. Vendors are responding with built-in multi-factor authentication, session recording, and role-based access down to individual screens and tags, rather than leaving those controls to be bolted on by the integrator after commissioning.