. OPC Unified Architecture. Part 2: Security Model. Release 1.04. 2018 -08 -03. , OPC Foundation, 2018.

This document describes the security model of the OPC Unified Architecture (OPC UA) technology. It outlines security threats across physical, hardware, and software environments, countermeasures, authentication, authorization, confidentiality, integrity, auditing mechanisms, certificate management, and deployment best practices.