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:

Its 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.