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

Question

Answer

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

Answer

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

Answer

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

Answer

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

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Using public key cryptography, X adds a digital signature σ to message M, encryp...

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