What happens if an attacker changes the Tag (MAC) and ciphertext during transit while using a message authentication code (MAC)? .

I'm not acquainted with the term "multifactor authentication." The issue is how it prohibits the use of compromised or stolen credentials.

PPP authentication settings allow for either PAP or CHAP. Is there a riskier choice? Provide context for your answer.

You may choose between PAP and CHAP when setting PPP authentication. Which one is the safer option? Your response should be explained.

You have the choice of utilizing PAP or CHAP when setup the PPP authentication on your computer. Which of these choices is the safest one? It is essential that you provide an explanation for your response.

In the process of message authentication, certain attacks in particular are considered and analysed?

What happens if an attacker attempts to alter the Tag (the MAC) and the ciphertext when a message authentication code (MAC) is being used? Describe why a successful attack like this would never be possible since the recipient might detect a changed tag or ciphertext.

Is there a significant difference between the two user authentication methods when it comes to granting remote access? For the person in question, which of these two dangers was more severe?

Is it possible for a message authentication code to change the Tag or the ciphertext while it is in transit? Recipients will always be able to detect a tampered Tag/ciphertext, rendering this attack futile.

You can use either PAP or CHAP as your authentication mechanism when establishing PPP authentication. Which of the following offers the greatest level of security? It is imperative that you give a justification for your behavior.