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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.7 Verifying Message Security
  Certificate validation fails. If the Message is secured with symmetric algorithms, then a Bad_SecureChannel TokenUnknown e rror shall be reported if the TokenId refers to a SecurityToken that ... SequenceNumber is not valid, the receiver shall log a Bad_SequenceNumberInvalid error. At this point the SecureChannel knows it is dealing with an authenticated Message that was not tampered with