Re: [oc] submit for IDEA processor

[tom st denis <tomstdenis@yahoo.com>]

--- Rudolf Usselmann <rudi@asics.ws> wrote:
> on 9/14/00 7:27, tom st denis at tomstdenis@yahoo.com wrote:
> 
> > 
> > --- MARTADINATA A <marta@vlsi.itb.ac.id> wrote:
> >> Hi, Damjan
> >> 
> >> We think we must submit our core design project about
> >> IDEA(International
> >> Data Encryption Algorithm) processor into the opencores main page
> >> in
> .....
> >> and 
> >> http://www.uspto.gov/patft/index.html
> >> 
> >> We will just use that algorithm to design a IDEA core in which We
> >> will
> >> make consistently its patent or copyright put on our developed
> >> core.
> >> We think that it is noproblem as long as for a core.
> > 
> > You cannot sell the core however, at any time.
> 
> Well, you can't build it at all ! Even if you would want to give
> it away !

No that is wrong, Ascom has granted a non-profit license to all users
of IDEA.  It's only if you go commercial that you have to pay for it.

> >> The IDEA algorithm is more secret than DES algoritma because the
> >> IDEA
> >> secret key, 128-bit, is longer than DES key, 56-bit. And also the
> >> IDEA
> >> round, 8, is less than the DES round, 16. So, the IDEA processor
> >> will be 
> >> faster and more secret than DES.
> > 
> > I doubt IDEA is much faster since it requires multiplications in
> > Z65537.  
> 
> Speed is a relative term. I can make any core execute in one cycle
> at a high frequency if I pipeline it.
> 
> The important question here is: How many cycles of latency are
> acceptable ?
> 
> Look at my DES core (www.opencores.org/cores/des). The fast
> implementation
> has a total of 18 pipeline stages, but can execute a crypt/encrypt
> every
> cycle (similar to a RISC CPU). In the current form it can run at
> about
> 75Mhz in a Xilinx Vertex FPGA. I could double the frequency by
> doubling
> the number of pipeline stages. So it could be made to run at 150Mhz,
> but
> would have a 36 cycle latency.

I must admit I now less about the hardware side, I just assumed that
DES was simpler and easier todo in hardware then IDEA would be.

Tom

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