James G. Sack (jim) wrote:
[EMAIL PROTECTED] wrote:
On Thu, Aug 28, 2008 at 03:55:05PM -0700, David Brown spake thusly:
Can this CPU implement a decent hash once a minute? If so, and it
still gets decent power, that would be the easiest way, and there
would be less likelihood of patent issues.
It isn't just a hash you need. You need a unique value that nobody else can
predict. What are you going to hash that would produce such a thing?
A keyed hash does use a secret
http://en.wikipedia.org/wiki/HMAC
Ah, I see. This is the piece I've been missing.
So all we have to do is find a way to implement it in a microcontroller.
This might be helpful:
http://pdfserv.maxim-ic.com/en/an/app150.pdf
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Tracy R Reed
http://tracyreed.org
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