Date   : Thu, 23 Sep 1993 12:23:29 EDT
From   : Bonfield "James./Staden" <jkb@...>
Subject: Re: Newbie on the list ;-)

Hello,

>>       I've got a DES (Data Encryption Standard) encryption program that I
>>should be able to get onto UNIX and hence on the ftp site. If people want such
>>a beast then it'll be interesting to know. It supports both ECB and CBC cipher
>>methods.
>
>That sounds pretty cool! Love to see it...

I'll have to dig it up. It's currently in several parts - a basic program to
assemble the code and save to disk, and a basic frontend to drive the machine
code program. It creates a 'whatever.E' and you should remember to blank
'whatever' first (for small files simply a clear memory and *SAVE over the top
should suffice) before removing.

There was another DES program published in the Micro User just as I was
finishing mine. They appeared to encrypt to different strings which is
worrysome. They both decrypted correctly, so quite what is different I'm
uncertain. I've never got around to testing mine to see if it does infact
encrypt correctly. My implementation was (on something like a 20K file) about
7 times faster than the micro user one. Mainly due to the fact that the MU one
for some absurd reason kept recalculating the 16 keys for each 8 byte block
which needs only be done once.

I can get it onto a UNIX system via a friend. Is that an acceptable medium for
you?

       James