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The feature of a digital signature that ensures the sender
cannot later deny generating and sending the message is:
A. data integrity.
B. authentication.
C. nonrepudiation.
D. replay protection.
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Answer: C
All of the above are features of a digital signature.
Nonrepudiation ensures that the claimed sender cannot later
deny generating and sending the message. Data integrity
refers to changes in the plaintext message that would result
in the recipient failing to compute the same message hash.
Since only the claimed sender has the key, authentication
ensures that the message has been sent by the claimed
sender. Replay protection is a method that a recipient can
use to check that the message was not intercepted and replayed.
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