Re: [Discuss-gnuradio] question about using FSK on noise

2016-06-07 Thread abhinav narain
Dear Marcus, On Tue, Jun 7, 2016 at 6:05 AM, Marcus Müller wrote: > Hi Abhinav, > > Cool research, with lots of security implications :) ! > Out of curiosity: as there are a lot of different power supply > topographies, which one are you concentrating on? What does one find in > "normal" laptop

Re: [Discuss-gnuradio] question about using FSK on noise

2016-06-07 Thread Marcus Müller
Hi Abhinav, On 07.06.2016 17:08, abhinav narain wrote: > Dear Marcus, > > On Tue, Jun 7, 2016 at 6:05 AM, Marcus Müller > mailto:marcus.muel...@ettus.com>> wrote: > > Hi Abhinav, > > Cool research, with lots of security implications :) ! > Out of curiosity: as there are a lot of differ

Re: [Discuss-gnuradio] question about using FSK on noise

2016-06-07 Thread abhinav narain
Dear Chris, RF actually! Thanks, Abhinav On Tue, Jun 7, 2016 at 10:11 AM, Christopher Richardson < chrisrichardso...@gmail.com> wrote: > Hi Abhinav, > > This sounds really interesting! > > Are you using RF or ultrasound out of interest, to grab emissions from the > SMPS? > > cheers > > Chris >

Re: [Discuss-gnuradio] question about using FSK on noise

2016-06-07 Thread Christopher Richardson
Hi Abhinav, This sounds really interesting! Are you using RF or ultrasound out of interest, to grab emissions from the SMPS? cheers Chris On Tue, Jun 7, 2016 at 6:35 AM, abhinav narain wrote: > Hi all, > I am trying to make a covert communication channel using SMPS noise > generated by the p

Re: [Discuss-gnuradio] question about using FSK on noise

2016-06-07 Thread Marcus Müller
Hi Abhinav, Cool research, with lots of security implications :) ! Out of curiosity: as there are a lot of different power supply topographies, which one are you concentrating on? What does one find in "normal" laptop power supply "bricks"? Is it the "classical" fixed-frequency PWM buck, where the

[Discuss-gnuradio] question about using FSK on noise

2016-06-06 Thread abhinav narain
Hi all, I am trying to make a covert communication channel using SMPS noise generated by the processor as a part of my research. I see a change in frequency emitted by the processor when I run the following loop (http://pastebin.com/uRghLuLm) with message variable containing the message, and see t