GATE Computer Science (CS) 2013 Solved Paper

Question : 23 of 65

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Using public key cryptography, X adds a digital signature σ to message M, encrypts <M, σ>, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations?

Encryption: X’s private key followed by Y’s private key; Decryption: X’s public key followed by Y’s public key
Encryption: X’s private key followed by Y’s public key; Decryption: X’s public key followed by Y’s private key
Encryption: X’s public key followed by Y’s private key; Decryption: Y’s public key followed by X’s private key
Encryption: X’s private key followed by Y’s public key; Decryption: Y’s private key followed by X’s public key

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