Newsgroups: sci.crypt
Path: cactus.org!ritter
From: ritter@cactus.org (Terry Ritter)

Subject: Re: Ladder DES
Message-ID: <1994Feb25.175256.1510@cactus.org>
Organization: Capital Area Central Texas UNIX Society, Austin, Tx
References: <1994Feb22.083353.26012@cactus.org> <2kejt8$1384@msuinfo.cl.msu.
+           edu>
Date: Fri, 25 Feb 1994 17:52:56 GMT


 In <2kejt8$1384@msuinfo.cl.msu.edu>  mrr@scss3.cl.msu.edu
 (Anonymous) writes:

>Another, already somewhat widely used alternative is
>RSA Data Security's "DESX", as implemented in their commercial
>products MailSafe and BSAFE since 1986/87.  DESX is ordinary
>DES with pre- and post-processing to expand keysize and
>security.  Like Ladder DES, it is faster than triple-DES.

 I don't find it in the RSA FAQ.  Where was this design published
 openly for comment?  What were the comments?


>I have some reason to believe that RSA may be willing to
>allow use of DESX free of licensing fees.  Perhaps someone
>from RSA would comment?

 What is the patent number?  Without a patent, there is no need to
 ask permission.



 Terry