Re: RC5/6 patents

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Perry E. Metzger (perry@piermont.com)
Mon, 20 Jul 1998 20:52:29 -0400


Paulo Barreto writes:
> At 11:04 1998.07.20 -0700, Bob Baldwin wrote:
>
> > The RC5 cipher is patented in the US and it
> >covers most forms of data and key dependent rotations.
> >It does not cover prior art such as the Madryga
> >cipher (see Bruce's book).
>
> :-O
>
> You mean the RC5 patent covers, say, CAST-128, CAST-256, and MARS?

I'm sure Jim Bidzos would like us to believe that. I'm pretty certain
from my own point of view that the patent is invalidated by prior art,
but proving that will cost several tens of thousands of dollars.

.pm


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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:20:41 ADT