Definitions for "Message Authentication Code"
A fixed-length data item that is sent together with a message to ensure integrity, also known as a MIC.
A message digest (MD) produced from a secret key and sent along with a message. It ensures that the message has not been corrupted in transit, either accidentally or maliciously, and that the creator of the message digest is a particular person, company, or other entity.
A data field, the contents of which can be used to verify the integrity of a message, or selected message elements. ISO
(Advanced Security Administrator's Guide; search in this book)