From: "Harvey Rook (Exchange)" <hrook@exchange.microsoft.com>
Date: Sat, 14 Nov 1998 06:27:01 +0800
To: "'Eric Cordian'" <cypherpunks@cyberpass.net
Subject: RE: Rivest Patent
Message-ID: <2FBF98FC7852CF11912A0000000000010D19AD69@DINO>
MIME-Version: 1.0
Content-Type: text/plain



It's a little bit more complicated than that. RC-6, which also uses data
dependant rotations is patent free.

Harv.

> -----Original Message-----
> From: Eric Cordian [mailto:emc@wire.insync.net]
> Sent: Friday, November 13, 1998 11:25 AM
> To: cypherpunks@cyberpass.net
> Subject: Re: Rivest Patent
> 
> 
> JYA writes:
> 
> > Ron Rivest received on November 10 "US Patent 5835600: 
> > Block encryption algorithm with data-dependent rotations:" 
> > http://jya.com/rivest111098.htm (22K) 
> 
> So we can't use the rotate instruction with a data-dependent shift 
> count in a block encryption algorithm without a license from Ron?
> 
> Foo on that.
> 
> -- 
> Sponsor the DES Analytic Crack Project
> http://www.cyberspace.org/~enoch/crakfaq.html
>