Which of the following encryption methods uses a matching pair of key-codes, securely distributed, which are
used once-and-only-once to encode and decode a single message?
A.
Blowfish
B.
Tripwire
C.
certificate
D.
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.