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• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.2.6 Integrity
  Integrity OPC UA uses Symmetric and Asymmetric Signatures to address Integrity as a security objective ... Asymmetric Signatures are used in the key agreement phase during the SecureChannel establishment. The Symmetric Signatures are applied to all other Message s including PubSub messages. OPC UA relies upon