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 <j...@baylink.com> wrote: > ----- Original Message ----- > > From: "Scott Helms" <khe...@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 > j...@baylink.com > Designer The Things I Think RFC > 2100 > Ashworth & Associates http://baylink.pitas.com 2000 Land > Rover DII > St Petersburg FL USA #natog +1 727 647 > 1274 > >
