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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

Explanation:
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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