Using public key cryptography, X adds a digital signature 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?

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

Using public key cryptography, X adds a digital signature to message

1.	Using public key cryptography, X adds a digital signature to message M, encrypts < M, > 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 private 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» E.

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

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