Mac vs hash4/4/2023 However, some authors use MIC to refer to a message digest, which aims only to uniquely but opaquely identify a single message. The term message integrity code (MIC) is frequently substituted for the term MAC, especially in communications to distinguish it from the use of the latter as media access control address ( MAC address). The MAC value protects a message's data integrity, as well as its authenticity, by allowing verifiers (who also possess the secret key) to detect any changes to the message content. In other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed. In cryptography, a message authentication code ( MAC), sometimes known as a tag, is a short piece of information used for authenticating a message. Not to be confused with Medium access control.
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