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GATE | GATE CS 2013 | Question 13
Using public key cryptography, X adds a digital signature [Tex]\\sigma[/Tex] to message M, encrypts < M, [Tex]\\sigma[/Tex] >, 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
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