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Message confidentiality is using

  • A.
    Cipher Text
  • B.Cipher
  • C.Symmetric-Key
  • D.Asymmetric-Key

Answer: D

Correct answer: Asymmetric-Key

In an asymmetric system the sender encrypts with the receiver's public key, so only the holder of the matching private key can read the message. That gives confidentiality without the two parties ever having shared a secret in advance.

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