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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.7 Verifying Message Security
  Message is an OpenSecureChannel request. For other Messages, it shall report a Bad_SecureChannelUnknown error if the SecureChannelId is not recognized. If the Message is an OpenSecureChannel request ... originally create the SecureChannel . The receiver shall verify the ReceiverCertificateThumbprint and report a Bad_CertificateInvalid error if it does not recognize it. The receiver shall check that the Certificate