A message authentication code will reveal any tampering, accidental or intentional.
The validity of a transmitted message. Message integrity means that a message has not been tampered with or altered. The most common approach is to use a hash function that combines all the bytes in the message with a secret key and produces a message digest that is difficult to reverse.
When using a Secret Key in conjunction with a message to attain Message Integrity, the resulting digest is known as the Message Authentication Code, or MAC.
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