[hobby] [notes] [sdr] [spam] was Re: SDR projects have been developing

Karl gmkarl at gmail.com
Wed May 5 13:43:54 PDT 2021

On Wed, May 5, 2021, 4:26 PM coderman <coderman at protonmail.com> wrote:

> Hash: SHA512
> hello Karl, replies in the clear below, as usual :)
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Wednesday, May 5, 2021 11:14 AM, Karl <gmkarl at gmail.com> wrote:
> >
> > I have some books digitally archived, but with a focus on shielding
> > rather than covert communications...
> this is EMSEC (emissions security)
> you can play with it youself, speaking of SDR :P
>   https://github.com/martinmarinov/TempestSDR

Your challenge is to understand things well enough to do this with an
rtl-sdr, which is quite possible given a screen refreshes so many times per

If you can do that, you can make a commonplace device that reveals the
displays of surrounding other devices.  This will get people actually
acting on this severe issue, rather than pretending it is safer to hide it.

Try to sniff something else too, so people don't think that encrypting and
shielding their display signals resolves the situation.  We need shielded
spaces to do secure work in, or we do not have a democracy, in this digital

the set of references, sources, and external links on wikipedia
> is also a fount of information:
>   https://en.wikipedia.org/wiki/Tempest_(codename)

Woah either I've never visited that article before or it's been improved a
lot in the past few years!

> enjoy!
> best regards,
> c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0NDFD
> DIACAP4kC+rW41i3eevP9FiLJi7Szi9J6rUT/5/ZYdA321+mngD/QIKdbboduMmr
> 8bQtm4nUUFKA06SrYhUUgcgMNuSRgp8=
> =HVPu
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