Which key is used to encrypt a message when sending confidential data to a receiver using public-key encryption?

Options

  • A. Sender's private key
  • B. Receiver's public key
  • C. Receiver's private key
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

B. Receiver's public key

Detailed Explanation

Correct Answer: Receiver's public key

  • For confidentiality, the sender encrypts the message using the receiver's public key.
  • Only the corresponding private key can decrypt the encrypted message.
  • The receiver keeps that private key secret.