Which of the following methods of encryption has been proven to be almost unbreakable when correctly used?

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Which of the following methods of encryption has been proven to be almost unbreakable when
correctly used?

A.
key pair

B.
Oakley

C.
certificate

D.
3-DES

E.
one-time pad

F.
None of the choices.

Explanation:
It’s possible to protect messages in transit by means of cryptography. One method of encryption –
-the one-time pad –has been proven to be unbreakable when correctly used. This method uses a
matching pair of key- codes, securely distributed, which are used once-and-only-once to encode
and decode a single message. Note that this method is difficult to use securely, and is highly
inconvenient as well.

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