> On May 5, 2016, at 4:53 AM, Erik Baigar <e...@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. https://www.cl.cam.ac.uk/~mgk25/emsec/softtempest-faq.html paul
