[Cryptography] Tempest and limits on receiving

Peter Gutmann pgut001 at cs.auckland.ac.nz
Tue Apr 4 20:58:11 EDT 2017


Bob Wilson <wilson at math.wisc.edu> writes:

>Have you tried to buy a shortwave radio that covers all of the frequencies
>from, say, 100MHz to 10GHz? There are quite a few receivers that say they do
>that, until you look at the footnote saying that reception of certain
>frequencies is disabled, because the disabled frequencies are used by some
>cell 'phones. 

That's only ones meant for the US market, or where the sales are small enough
that they don't do US vs. non-US versions, which is why many US users would
try and get the non-US models, except that US customs then started seizing
them at the border.  OTOH many of the US-targeted models suffer from a series
of strange design defects where they'll re-enable full coverage when you cut a
circuit trace or jumper (older models) or press the right combination of keys
(newer models).  For some odd reason the magic nerve pinch always seems to
leak in some manner soon after a particular model is released.

Peter.


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