In the process of deploying a new e-mail system, an information security manager would like to
ensure the confidentiality of messages while in transit. Which of the following is the MOST
appropriate method to ensure data confidentiality in a new e-mail system implementation?

A.
Encryption

B.
Digital certificate

C.
Digital signature

D.
I lashing algorithm

Explanation:

To preserve confidentiality of a message while in transit, encryption should be implemented.
Choices B and C only help authenticate the sender and the receiver. Choice D ensures integrity.