Digital signatures are used for ensuring which of the following items? (Choose two.)

A.
Confidentiality

B.
Integrity

C.
Non-Repudiation

D.
Availability

E.
Algorithm strength

Explanation:
A digital signature is similar in function to a standard signature on a document. It validates the integrity of the
message and the sender. The message is encrypted using the encryption system, and a second piece of
information, the digital signature, is added to the message.
Nonrepudiation prevents one party from denying actions that they carried out and in the electronic world
nonrepudiation measures can be a two-key cryptographic system and the involvement of a third party to verify
the validity. This respected third party ‘vouches’ for the individuals in the two-key system. Thus non-repudiation
also impacts on integrity.