Which of the following terms refers to a mechanism which proves that the sender really sent a
particular message?

A.
Non-repudiation

B.
Confidentiality

C.
Authentication

D.
Integrity

Explanation:
Non-repudiation is a mechanism which proves that the sender really sent a message. It provides an
evidence of the identity of the senderand message integrity. It also prevents a person from denying
the submission or delivery of the message and the integrity of its contents.
Answer option C is incorrect. Authentication is a process of verifying the identity of a person or
network host.
Answer option B is incorrect. Confidentiality ensures that no one can read a message except the
intended receiver.

Answer option D is incorrect. Integrity assures the receiver that the received message has not been
altered in any way from the original.
“http://en.wikipedia.org/wiki/Non-repudiation”