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"Brian Bagnall" <bbagnall@mts.net> writes:
>
> > I don't think there is enough room for the WHOLE PGP package in the RCX,
> > perhaps just a single cipher, RSA key exchange and a single hash method.
> > Does anyone know off hand if any of these features require floating
> > point? You could probably substitute for an algorithm that doesn't.
They don't, but they need bignums (really big integers).
> If you need floating point numbers the leJOS JVM for the RCX uses floating
> point:
>
> http://lejos.sourceforge.net
It would be a nice project for somebody to implement bignums on leJOS,
the API is in java.math.BigInteger .
> This seems like a very intersting idea. I actually wanted to skip the RCX
> altogether and somehow link up a networking protocol using just the IR
> Towers. One computer could communicate with another and you could even throw
> in some encryption so no one else could intercept it.
You could just run PPP over it I suppose, with some encryption
(IPSec?) on top of it. Would be dead slow, though.
The charm of the RCX would be that it could be a token,
like a smartcard, which holds the key securely.
When you need to sign something the PC could compute a hash,
send it over to the RCX, who asks for a PIN, signs it and
sends the signature back to the PC.
The only problem is that the RCX is not a reliable place to store data,
unless you are really careful fith exchanging batteries.
Jürgen
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
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 | | Re: RCX as a PGP engine
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| (...) If you need floating point numbers the leJOS JVM for the RCX uses floating point: (URL) seems like a very intersting idea. I actually wanted to skip the RCX altogether and somehow link up a networking protocol using just the IR Towers. One (...) (25 years ago, 9-Mar-02, to lugnet.robotics.rcx.legos)
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