Information Security: Principles and Practices 2nd Edition by Jim Breithaupt, Mark S. Merkow

Exercise 19

Which of the following offers confidentiality to an e-mail message?

A. the sender encrypting it with its private key

B. the sender encrypting it with its public key

C. the sender encrypting it with the receiver’s public key

D. the sender encrypting it with the receiver’s private key

Step 1 of 2

Confidentiality to emails

Emails can be encrypted and their confidentiality can be maintained by using different algorithms such as PGP or S/MIME. Both these techniques are used to encrypt mails while sending them over the network. It helps enhance their security and maintain the confidentiality of the data.

The basic technique used in PGP is that secret key is encrypted with the receiver’s public key, which is sent with the encrypted message.

Therefore, the correct option is,

C. the sender encrypting it with the receiver’s public key.