The feature of a digital signature that ensures the sender cannot later deny generating and
sending the message is called:
A.
data integrity.
B.
authentication.
C.
non repudiation.
D.
replay protection.
Explanation:
All of the above are features of a digital signature. Non repudiation 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.