A company uses 'Asymmetric' encryption for secure email. If Alice wants to send a confidential email to Bob that only Bob can read, which key does she use to encrypt it?

Answer options:

Alice's Public Key

Bob's Public Key

Alice's Private Key

Bob's Private Key

How to approach this question

Confidentiality = Recipient's Public Key. Authentication = Sender's Private Key.

Full Answer

B.Bob's Public Key✓ Correct

To ensure confidentiality in asymmetric encryption, the sender encrypts the message using the recipient's Public Key. Only the recipient possesses the corresponding Private Key to decrypt it.

Common mistakes

Confusing encryption (for secrecy) with signing (for identity).

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