Q. In public key encryption system if A encrypts a message using his private key and sends it to B:

A
Even if B knows who sent the message it cannot be decrypted
B
If B knows it is from A he can decrypt it using A's public key
C
It cannot be decrypted at all as no one knows A's private key
D
A should send his public key with the message
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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