When using a MAC (message authentication code), what happens if an attacker attempts to change the Tag (MAC) and ciphertext in transit? Explain why this attack will always fail as the recipient can recognize a changed Tag/ciphertext?

When using a MAC (message authentication code), what happens if an attacker attempts to change the Tag (MAC) and ciphertext in transit? Explain why this attack will always fail as the recipient can recognize a changed Tag/ciphertext?

LINUX+ AND LPIC-1 GDE.TO LINUX CERTIF.

5th Edition

ISBN:9781337569798

Author:ECKERT

Publisher:ECKERT

Chapter12: Network Configuration

Section: Chapter Questions

Problem 10RQ

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What happens if an attacker attempts to modify the Tag (the MAC) and the ciphertext while the message is in transit while using a message authentication code (MAC)? Explain why this kind of attack will never succeed since the recipient would be able to recognise a changed tag or ciphertext.
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An attacker attempts to alter the Tag (the MAC) and the ciphertext in transit while using a MAC (message authentication code). What would happen? Provide a rationale for why this attack will fail, that is, why the receiver will always be able to identify a changed Tag or ciphertext.
What happens if an attacker changes the Tag (MAC) and ciphertext during transit while using a message authentication code (MAC)? .
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