[105520] in Cypherpunks
RE: Rivest Patent
daemon@ATHENA.MIT.EDU (Harvey Rook (Exchange))
Fri Nov 13 18:25:46 1998
From: "Harvey Rook (Exchange)" <hrook@exchange.microsoft.com>
To: "'Eric Cordian'" <emc@wire.insync.net>, cypherpunks@cyberpass.net
Date: Fri, 13 Nov 1998 13:45:05 -0800
Reply-To: "Harvey Rook (Exchange)" <hrook@exchange.microsoft.com>
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
>
