Which of the following does not occur when sending a message using a digital envelope?

(a) The message is encrypted using a symmetric secret key.
(b) The secret key is encrypted using public-key encryption.
(c) A courier is used to transmit the symmetric secret keys between parties.
(d) All of the above occur when sending a message using a digital envelope.

(c) A courier is used to transmit the symmetric secret keys between parties.

Computer Science & Information Technology

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