Errata exists for this version of the document.

See 4.3.5 for a description of this threat.

OPC UA counters Message alteration by the signing of Messages that are specified in OPC 10000-4 and OPC 10000-14. If Messages are altered, checking the signature will reveal any changes and allow the recipient to discard the Message. This check can also prevent unintentional Message alteration due to communication transport errors.