MAC Military Abbreviation

Mandatory Access Control

Means of restricting access to objects based on the sensitivity of the information contained in the objects and the formal authorization (i.e., clearance, formal access approvals, and need-to-know) of subjects to access information of such sensitivity.

Message Authentication Code

In cryptography, a message authentication code is a short piece of information used to authenticate a message and to provide integrity and authenticity assurances on the message. Integrity assurances detect accidental and intentional message changes, while authenticity assurances affirm the message's origin. A MAC algorithm, sometimes called a keyed hash function, accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC. The MAC value protects both a message's data integrity as well as its authenticity, by allowing verifiers to detect any changes to the message content.

Maneuver Area Command

Mortuary Affairs Center

Maneuver Area Cqmmands

Marine Area Command

Mepn Aerodynamic Center

Measurement and Analysis Centre

Medium Armoured Car