A message is encrypted using public key cryptography to send a message from sender to receiver. Which one of the following statements is True?

1. ASender encrypts using receiver’s public key
2. BSender encrypts using his own public key
3. CReceiver decrypts using sender’s public key
4. DReceiver decrypts using his own public key

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: A. Sender encrypts using receiver’s public key

Explanation

For confidentiality the sender encrypts with the receiver's public key; only the receiver's private key can decrypt.

Note: Statement D (the receiver decrypts with his own private key) is close but says 'public', so it is wrong.