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:

only help authenticate the sender and the receiver. Choice D ensures integrity.