Question

In RSA, if user A wants to send an encrypted message to user B, the plaintext is encrypted with the public key of _______.

a. user A
b. user B
c. the network
d. a third party.

Answer 1

In RSA encryption, User A must encrypt their message with the public key of User B to securely send the message; only User B's private key can decrypt it.

Therefore, the correct answer is: option b. user B

Step-by-step explanation:

RSA is an asymmetric cryptographic algorithm that uses a pair of keys: a public key for encryption and a private key for decryption.

In the context of RSA encryption, if user A wants to send an encrypted message to user B, the plaintext should be encrypted with the public key of user B.

When user A encrypts a message using user B's public key, user B can decrypt the encrypted message using their private key which is kept secret.

This ensures that only user B, who possesses the matching private key, can read the message. User A cannot decrypt the message once it's encrypted with user B's public key, reinforcing the security of the communication.