Answer:
A. The most secure email message authenticity and confidentiality is provided by signing the message using the sender’s public key and encrypting the message using the receiver’s private key
Explanation:
Public key cryptography helps to send public key in an open and an insecure channel as having a friend's public key helps to encrypt messages to them.
The private key helps to decrypt messages encrypted to you by the other person.
<u>The most secure email message authenticity and confidentiality is provided by signing the message using the sender’s public key and encrypting the message using the receiver’s private key</u>
... a <span>character-encoding </span><span>scheme. ASCII being the most well-known one.</span>
Plan out your day and how long it will take you to do everything. then if you still don’t have time, see if there’s anything you can shorten in time