A message authentication code (MAC) is a key-dependent, one-way hash function that allows only specific recipients (symmetric key holders) to access the message digest.
Message Authentication Code (MAC), also referred to as a tag, is used to authenticate the source and nature of a message. MACs use authentication cryptography to confirm the legitimacy of data sent through a network or transmitted from one person to another.
Message authentication codes (MACs) are typically used in electronic funds transfers (EFTs) to maintain information integrity. They confirm that a message is accurate; that it really does come, in other words, from the stated sender, and hasn't undergone any modifications en route.
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