Matthew would like to send a private message to Richard using a symmetric cryptosystem. What key should Matthew use to encrypt the message?

Matthew would like to send a private message to Richard using a symmetric cryptosystem. What key should Matthew use to encrypt the message?


a. Matthew's public key
b. Matthew's private key
c. Richard's public key
d. Richard's private key
e. Shared secret key


Answer: e. Shared secret key


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