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  1. Using public key cryptography, X adds a digital signature σ 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?
    2. 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

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    Answer : Option D

    Explanation :

    -NA-

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