Question: If Alice further uses a message authentication code and generates a tag sigma on c ( using a shared key k ) . Now

If Alice further uses a message authentication code and generates a tag \sigma on c (using a shared key k).Now Alice sends both c and \sigma to Bob. Can Bob now be convinced that Alice already committed to the agreement, i.e., c is a legitimate contract that, if violated, Bob can sue Alice in court? Explain why

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