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Encryption and decryption provide secrecy, or confidentiality, but not

  • A.
    Authentication
  • B.Integrity
  • C.
    Privacy
  • D.
    All of above

Answer: B

Correct answer: Integrity

Encryption hides the content but does not protect it from alteration: an attacker who cannot read the ciphertext may still change bits in it, and the receiver would decrypt something different without knowing. Integrity therefore needs a hash or a MAC in addition to the encryption.

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