GATE | GATE 2017 MOCK II | Question 65

In public key and private key cryptography, host ‘A’ has Pu_A and Pr_A, host ‘B’ has Pu_B and Pr_B 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) Pu_A
(B) Pu_B
(C) Pr_A
(D) Pr_B

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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