Q. In public key encryption if A wants to send an encrypted message:

A
A encrypts message using B's public key
B
A encrypts message using B's private key
C
A encrypts message using his private key
D
A encrypts message using his public key
Solution:

Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys – a public key and a private key. The public key is used to encrypt and the private key is used to decrypt.

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