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TEMPEST, Eavesdropping

>Their chief concern doesn't seem to be folks like us, but rather
>concerns about vans parking outside high tech and defense contractors
>and slurping up what they can [...]

When banks start signing with private keys, then we get an even more
interesting monitoring problem.

>And someone asked about building Faraday cages. Don't even try! 

Sometimes it is cheaper to build a whole building to be tempest-spec
than to buy all tempest-spec electronics.  What I have heard about
such stuff is solid copper walls and no windows.  No exacly your
classical Faraday cage; more like your classical Gaussian surface. :->

TEMPEST is an acronym.  I don't remember for what.