GATE | GATE CS 2013 | Question 13

Using public key cryptography, X adds a digital signature \sigma to message M, encrypts , and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations?
(A) Encryption: X’s private key followed by Y’s private key; Decryption: X’s public key followed by Y’s public key
(B) Encryption: X’s private key followed by Y’s public key; Decryption: X’s public key followed by Y’s private key
(C) Encryption: X’s public key followed by Y’s private key; Decryption: Y’s public key followed by X’s private key
(D) Encryption: X’s private key followed by Y’s public key; Decryption: Y’s private key followed by X’s public key


Answer: (D)

Explanation: Refer http://www.facweb.iitkgp.ernet.in/~sourav/PublicKeyCrypto.pdf and http://en.wikipedia.org/wiki/Public-key_cryptography

Quiz of this Question



My Personal Notes arrow_drop_up


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.