Using public key cryptography, X adds a digital signature s 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

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Q: hat is the public key

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