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In Message Integrity, message digest needs to be kept

  • A.
    Secret
  • B.Low
  • C.High
  • D.
    Constant 0

Answer: A

Correct answer: Secret

The same reason: a digest an attacker can replace gives no protection, since the altered message would carry a correctly computed digest. Keeping it secret, or computing it with a secret key, is what makes the check meaningful.

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