Which of the following message services provides the
strongest protection that a specific action has occurred?
A. Proof of delivery
B. Nonrepudiation
C. Proof of submission
D. Message origin authentication
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Answer: B
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 protection 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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An organization has contracted with a vendor for a turnkey solution for their electronic toll collection system (ETCS). The vendor has provided its proprietary application software as part of the solution. The contract should require that: A. a backup server be available to run ETCS operations with up-to-date data. B. a backup server be loaded with all the relevant software and data. C. the systems staff of the organization be trained to handle any event. D. source code of the ETCS application be placed in escrow.
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