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[Tanner Lovelace <lovelace AT wayfarer.org>]

Rowland Smith said the following on 3/13/04 1:02 AM:

[... level of quoting removed! doesn't anyone bother to do that anymore!...]

[... description of TEMPEST ...]

> This poses a problem for e-voting.  It is possible for a third party to 
> monitor the unshielded touch-screens in a voting place.  With the help 
> of a second party inside the voting place, a correlation can be made 
> between a particular vote that was cast on a particular voting machine, 
> and the voter that cast the vote.  This (just like a human-readable 
> printout that could be carried out of the voting place) allows a voter 
> to prove to an entity that he/she voted for a particular candidate - 
> allowing voters to sell their votes
>
> Requiring TEMPEST hardened e-voting machines would probably stop 
> e-voting dead in the water due to the high cost.

Actually, I'm not sure it would be that much of a problem since
TEMPEST would work best if you've only got one computer.  With
multiple computers you'd have interference problems between
each machine.  Not impossible, but much more difficult.  It would
be much easier, if you were buying a vote and wanted to verify it
to get the voter to take a picture of it with their cell phone
camera.

BTW, for a good description of a TEMPEST setup, see The Cryptonomican
by Neal Stepheson.  You could probably set something up like that
with some of the software radio stuff the GNU Radio project has been
working on.

Cheers,
Tanner

--
Tanner Lovelace       | Don't move! Or I'll fill ya full of... little
lovelace AT wayfarer.org | yellow bolts of light! - Commander John Crichton