GATE | GATE 2017 MOCK II | Question 65

In public key and private key cryptography, host ‘A’ has PuA and PrA, host ‘B’ has PuB and PrB as public and private keys respectively. Now, if ‘A’ wants to send a message to ‘B’ securely, which key will be used by ‘A’ for encryption ?
(A) PuA
(B) PuB
(C) PrA
(D) PrB

Answer: (B)

Explanation: If the message is encrypted using PuB, then it can be decrypted using only PrB, which will be
known only to ‘B’.

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