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Alices uses a Message Authentication Code (MAC) to communicate with Bob. Eve later claims that she...

Alices uses a Message Authentication Code (MAC) to communicate with Bob. Eve later claims that she sent the some message x with auth(x) to to Bob but Alice claims the same. Bob can determine whether Eve or Alice sent the message.

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False

What is the answer true or false and why??

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Answer #1

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Alice uses a Message Authentication Code (MAC) to communicate with Bob. Thus Bob can use the Message Authentication Code (MAC) and verify that the message came from the stated sender and has also not been changed. Thus, data integrity and authenticity can be determined. Thus, True, Bob can determine whether Eve or Alice sent the message.

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