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Message digest needs to be

  • A.
    public
  • B.
    private
  • C.
    kept secret
  • D.None

Answer: C

Correct answer: kept secret

If the digest travelled openly alongside the message, an attacker could alter the message and recompute the digest to match. The digest must therefore be protected - kept secret, encrypted, or bound to a key - or the whole check is worthless.

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