huawei

Sat Jun 15 19:50:51 UTC 2013

What about through SDR? ie. http://nuand.com/

I mean, 'subscriber' seems to indicate a layman, but SDR isn't too complex
to get
running for someone with a modicum of electronics experience - especially
in this
day and age, where oscilloscopes and frequency analysis is available to
anyone with
some Google-fu.

On Sat, Jun 15, 2013 at 11:11 AM, Jay Ashworth <jra at baylink.com> wrote:

> ----- Original Message -----
> > From: "Scott Helms" <khelms at zcorum.com>
>
> > Is it possible? Yes, but it's not feasible because the data rate would be
> > too low. That's what I'm trying to get across. There are lots things that
> > can be done but many of those are not useful.
> >
> > I could encode communications in fireworks displays, but that's not
> > effective for any sort of communication system.
>
> At this point, of course, we hearken back to the Multics system, which
> needed -- in order to get the B1(?) common criteria security rating that it
> had -- to prevent Covert Channel communication between processes of
> different
> security levels *by means as low-bandwidth as sending morse code by
> modulating the system load*.
>
> So I don't think "there's too little bandwidth" is a good enough argument,
> Scott.
>
> But there's a much more important issue here:
>
> In some cases, like the Verizon Wireless 4G puck I mentioned earlier,
> manufactured by ZTE, *you can't see the back side of the device*.   There's
> nearly no practical way for a subscriber to know what's coming out of the
> 4G side of that radio, so it could be doing anything it likes.
>
> Verizon Wireless proper could know, but they have no particular reason to
> look
> and, some might argue, lots of reasons not to want to know.
>
> Cheers,
> -- jra
> --
> Jay R. Ashworth                  Baylink
> jra at baylink.com
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>