From: Ed Carp <erc@dal1820.computek.net>
Date: Thu, 7 Mar 1996 18:43:55 +0800
To: JonWienke@aol.com
Subject: Re: What's anyone know about Teledyne Electronic Technologies?
In-Reply-To: <960307014224_343625326@mail04.mail.aol.com>
Message-ID: <Pine.3.89.9603070009.A29145-0100000@dal1820.computek.net>
MIME-Version: 1.0
Content-Type: text/plain


On Thu, 7 Mar 1996 JonWienke@aol.com wrote:

> >Teledyne (TET) is out marketing a "new" crypto system as a competitor 
> >against DES and what TET calls "linear" cryptosystems.  They are claiming 
> >a non-linear approach in which (as best I can tell) they are permuting 
> >the s-boxes and using 4 bit/16 entry substitution tables.
> 
> Dont trust it unless you are a good cryptanalyst and have a copy of the
> source code.  Most commercial crypto products are crap.

You'd be surprised how many of them are doing the "message XOR key" stuff
that so many of us wrote when were, as Roy Scheider put it in 'Blue
Thunder', "young and stupid".  Also, S-boxes are a fancy way of getting
yourself into a lot of trouble while promoting a false sense of security -
they are *very* hard to get right, and it takes a lot of work to prove
that you haven't introduced a weakness with the "improvement".  See "S-Box
Design" in Schneier's book, page 349 for a good intro to designing such. 
--
Ed Carp, N7EKG    			Ed.Carp@linux.org, ecarp@netcom.com
					214/993-3935 voicemail/digital pager
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Finger ecarp@netcom.com for PGP 2.5 public key		an88744@anon.penet.fi

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The mark of a good conspiracy theory is its untestability.
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