A company uses 'Asymmetric Encryption' for secure email. If User A wants to send a confidential message to User B, which key should User A use to encrypt the message?

Answer options:

User A's Private Key

User A's Public Key

User B's Public Key

User B's Private Key

How to approach this question

Public Key Infrastructure (PKI): To send TO someone, use their PUBLIC key. To sign FROM yourself, use your PRIVATE key.

Full Answer

C.User B's Public Key✓ Correct

In asymmetric encryption, you encrypt with the recipient's Public Key. Only the recipient possesses the corresponding Private Key to decrypt and read the message.

Common mistakes

Encrypting with your own key (useless for secrecy) or thinking you have the other person's private key.

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