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Which of the following message related services give the highest evidence that a specific action has taken place?
Proof of delivery
Proof of submission
Nonrepudiation
Message origin authentication
Nonrepudiation services provide evidence that a specific action occurred. Nonrepudiation services are similar to their weaker proof counterparts, i.e., proof of submission, proof of delivery and message origin authentication. However, nonrepudiation provides stronger evidence because the proof can be demonstrated to a third party. Digital signatures are used to provide nonrepudiation. Message origination authentication will only confirm the source of the message and does not confirm the specific action that has been completed.
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