[Hardware] "success"

[Jim C. Nasby]

On Wed, Oct 18, 2006 at 06:54:02PM -0400, Martin Klingensmith wrote:
> Well, how is the data verified and sent back? (conceptually, I'm not 
> looking for details)
> There could always be some sort of software layer on a host computer 
> with any number of client FPGAs attached.
 
There's a residual that's computed as part of the normal clients, and
the server checks that.

The issue with having a host machine do the encryption is that the
decrypted data is then available for anyone to muck with.

> By the way, I made a simple top module and tried to synthesize the code 
> today. It started to work but I tried to re-run the synthesis and 
> Synplify Pro just sat there for hours running 100%. I'm not sure what's 
> going on with that - maybe it just needs a reboot. I don't know how much 
> space it will take up in an FPGA. It's a 155 stage 32 bit pipeline which 
> seems large by my standards. It is for this reason that I don't know 
> which device it will fit in (I use Xilinx S3-200 right now) or how fast 
> it will run.
> 
> I will give out the code once I figure out if there are any reasons not 
> to do so. It's basically the code I posted to this list 10 months ago 
> converted to Verilog and printed out with tac. It's also part of my 
> graduate thesis.
> 
> IMO the reward for breaking 72 bit encryption should be $100k
> --
> Martin K
> 
> 
> John L. Bass wrote:
> > 	Out of curiosity... is there any way to safely embed our encrypt/decrypt
> > 	functions in that code without it becomming public? Otherwise I'm not
> > 	sure how we'd be able to plug one of these in to the network...
> >
> > The answer is still effectively no. There would have to be a standard
> > hardware configuration to freeze it. Or at least a fixed set of cores
> > for every usable FPGA, which at least in the beginning would require
> > releasing the crypto to a half dozen or better FPGA developers (most
> > of the FPGA RC5 user community).
> >
> > 	On Wed, Oct 18, 2006 at 12:55:32PM -0600, Olivier Meyer wrote:
> > 	> >I just thought I'd let you guys know since this seems to be a 4 msgs a
> > 	> >year mailing list :-)
> >
> > Which is why this list is dead. The proprietary interests block open
> > access.
> >
> > John
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-- 
Jim C. Nasby, Database Architect            decibel at distributed.net
Give your computer some brain candy! www.distributed.net Team #1828

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