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What is MAC [Message Authentication Code]? – Definition, and More

What is MAC [Message Authentication Code]? - Definition, and More

MAC Definition

A MAC (Message Authentication Code) used to obtain certainty about the origin of data or messages and their integrity check.

MAC algorithms require two input parameters, firstly the data to be protected and secondly a secret key, and use both to calculate message authentication code.

It values protect both the message’s data integrity as well as its authenticity by allowing verifiers to detect any changes to the message content.

Also Read: What is Time Based One Time Password (TOTP)? – Definition, and More

How does MAC work?

  1. The sender calculates a MAC for this key and its message and then sends the message and the MAC to the recipient.
  2. It calculates the MAC for the received message with the key and compares the calculated MAC with the received one.
  3. The recipient interprets the agreement of both values as a successful integrity test.
  4. The message sent by a party who knows the secret key, and it did not change during the transmission.
  5. MACs do not protect against replay attacks. To do this, the message itself must contain data that ensure that repetitions can be detected.

What are hash functions and digital signatures in [MAC]?

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