A message authentication code is a key-dependent, one-way hash function that allows only specific recipients (symmetric key holders) to access the message digest.
A Message Authentication Code (MAC) is a tag used in cryptography to maintain the integrity of information passed through networks. As its name suggests, it confirms that the message received is authentic. It makes sure that the information sent has received by the specific receivers only. It keeps the legitimacy of the data passed. Also it is key-dependent which makes it safer. It is, in short, a hash function produced incorporating some secret values and information from keys so that the information passed will be received only by the stated receiver.
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