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MAC and Hash function

Illustrate the differences between the MAC and Hash function?

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MAC : In Message Authentication Code or MAC, secret key is shared by the sender and receiver. The MAC is added to the message at the source during the time when the message is supposed or identified to be correct.

Hash Function : The hash value is added to the message at source at time when the message is assumed or known to be correct. The hash function itself is not regarded as the secret.

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