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Public key cryptosystem is used for the encryption of

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Public key cryptosystem is used for the encryption of

(a) Messages

(b) Session key

(c) Session key & Messages

(d) None of the mentioned

I had been asked this question during an interview for a job.

I would like to ask this question from Pretty Good Privacy in portion Encryption and Decryption of Digital Communications

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The correct choice is (b) Session key

To explain I would say: Public key cryptosystem is used for encryption of messages and private key cryptosystem is used for encryption of messages.

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