On May 5, 2016, at 4:53 AM, Erik Baigar <erik at
baigar.de> wrote:
On Tue, 3 May 2016, Noel Chiappa wrote:
A set of standards for allowed levels of
emissions (in particular,
electro-magnetic radiation) from communication/computing gear, intended to
prevent listening to the activity of that gear:
https://en.wikipedia.org/wiki/Tempest_(codename)
Thanks, very interesting reading and this must be a quite sensitive
topic. As one party tries to develop equipment according to this
standard, other parties will try to "listen" even than...
One of the more interesting Tempest creations is a font (for CRT displays, i.e., ones with
analog video) that drastically reduces the emissions from the video signal. It was
created by Markus Kuhn and Ross Anderson at U. Cambridge.