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In a public key, private key cryptography, scheme given below, identify ‘A’ and ‘B’.

(a) A= Pu y , B= Pr x
(c) A= Pr y , B= Pu x
(b) A= Pr x , B= Pu y
(d) A= Pu x , B= Pr y

Edit:

what I know suppose A want to send message to B, it will use B's public key and B will  use its private key to decrypt the message.

so how answer is option d?

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3 Answers

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Option D..
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Option D is the correct answer.

The message is first encrypted with private key of x which acts as digital signature on the message and then with public key of y for enciphering the message such that only Y can decipher the message using it's private key.

Now that message was encrypted in the sequence PrX-PuY it has to be decrypted in the reverse sequence as PrY-PuX to get the message back.
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Option D is correct because any message is decrypted by sender key as public key and receiver private key.

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