What is message authentication code (MAC)? - Definition from WhatIs.com


message authentication code (MAC)

Part of the Authentication glossary:

A message authentication code (MAC) is a cryptographic checksum on data that uses a session key to detect both accidental and intentional modifications of the data. 

Learn more about message authentication code:

Find out how an attacker cracks a symmetric key-based system.

What are the differences between symmetric and asymmetric encryption algorithms?

This was last updated in November 2010
Posted by: Margaret Rouse

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