Re: Plaintext

Evan Jeffrey (ejeffrey@eliot213.wuh.wustl.edu)
Wed, 02 Jul 1997 16:36:48 -0500


>Something's been bothering me for a few days.
>
>If we hadn't have known _anything_ about the plain text of the
>DES-encrypted message, we wouldn't have been able to decrypt it, even
>using brute force. Is this correct?

True. You need some way to determine when you have the right code. This
isn't really a problem, as almost all messages have some sort of headers or
other identifying information. But no, other than that there is no real way
to detetermine one set of random-looking noise from any other.

===
Evan Jeffrey
erjeffre@artsci.wustl.edu

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all progress
depends on the unreasonable man.