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Which of the following options is TRUE about Message Authentication Code (MAC)?

33. Which of the following options is TRUE about Message Authentication Code (MAC)?

1. It should be easy to generate a MAC value from the message and key
2. The same MAC value should be generated for two different messages with the same key
3. The MAC value should be long and complex for better security
4. It should be possible to derive the original message from the MAC value

Answer: A) It should be easy to generate a MAC value from the message and key.

Explanation:

MACs are designed to be efficiently computable; it should be easy and quick to generate the MAC value from the input message and the shared secret key.