Home » Isaca » CISA » Which of the following message services provides the strongest evidence that a specific action has occurred?
Which of the following message services provides the strongest evidence that a specific action has occurred?
A. Proof of delivery
B. Nonrepudiation
C. Proof of submission
D. Message origin authentication
Correct Answer: B
Explanation/Reference:
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, nonrepudiationprovides 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 specificaction that has been completed.
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