A message would only be encrypted when it has been subjected to something like a message integrity check (MIC), but a message authentication code (MAC) also includes a secret key.
In contrast to that same Message Authentication Code (MAC), that creates the checksum using a shared secret, a Message Integrity Check (MIC) appears to be nothing more than simply a message checksum or hash digest.
Since the opposing side also must share the very same shared secret, it also makes the checksum data authenticated, preventing a third party from faking the checksum data.
Learn more about Message Integrity Check (MIC)
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