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Which of the following is a requirement for a secure Vernam cipher?

Which of the following is a requirement for a secure Vernam cipher?

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A.
The pad must be used just one time

B.
A symmetric key must be encrypted with an asymmetric key

C.
The private key must be only known to the owner

D.
It needs to hide the existence of a message

Explanation:
A one-time pad is a perfect encryption scheme because it is considered
unbreakable if implemented properly. One of these requirements is that the pad is
used only one time. It was invented by Gilbert Vernam in 1917, thus sometimes
referred to as the Vernam cipher.


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