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Alice sends a message to Bob over an insecure channel. Alice wants to ensure that Bob can verify the integrity of the message (That it
Alice sends a message to Bob over an insecure channel. Alice wants to ensure that Bob can verify the integrity of the message (That it has not been changed on the way) and authenticate the sender of the message (that Alice sent it). Bob also wants to make sure that Alice cannot repudiate sending the message.
Alice can use a hash, or a MAC, or a digital signature for integrity protection. Which one will serve all the three goals stated above and how?
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