Author Question: Which of the following does not occur when sending a message using a digital envelope? (a) The ... (Read 39 times)

B · **on:** Jul 7, 2018

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.

Question 2

Keys are made secure by choosing a(n) ________ so large that it is computationally infeasible to try all such combinations.

(a) algorithm.
(b) cipher.
(c) key length.
(d) key agreement protocol.