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Q44 Single choice

Joe is exchanging encrypted email with another party. Joe encrypts the initial email with a key. When Joe receives a response, he is unable to decrypt the response with the same key he used initially.

Which of the following would explain the situation?

A
An ephemeral key was used for one of the messages
B
A stream cipher was used for the initial email; a block cipher was used for the reply
C
Out-of-band key exchange has taken place
D
Asymmetric encryption is being used

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