To ensure authentication, confidentiality and integrity of a message, the sender should encrypt the hash of the
message with the sender’s:

A.
public key and then encrypt the message with the receiver’s private key.

B.
private key and then encrypt the message with the receiver’s public key.

C.
public key and then encrypt the message with the receiver’s public key.

D.
private key and then encrypt the message with the receiver’s private key.

Explanation:
Obtaining the hash of the message ensures integrity; signing the hash of the message with the sender’s private
key ensures the authenticity of the origin, and encrypting the resulting message with the receiver’s public key
ensures confidentiality. The other choices are incorrect.