Question

What is message integrity and message authentication?

Answer 1

Message authentication code. ... In cryptography, a message authentication code (MAC), sometimes known as a tag, is a short piece of information used to authenticate a message—in other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed.
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Answer 2

Message authentication code. ... In cryptography, a message authentication code (MAC), sometimes known as a tag, is a short piece of information used toauthenticate a message—in other words, to confirm that the messagecame from the stated sender (its authenticity) and has not been changed.