I discovered my speakers unintentionally transmitting as a microphone to a few different frequencies via GQRX recording (computer/Pinetab microphones completely disabled). We listen in remotely to hear all audio the computer is playing + any sounds in the computer's room- speakers unintentionally become a remote microphone.
When the speaker volume is turned down, the signal goes down and the broadcast goes away. When the speaker volume is down, it no longer functions as a remote microphone + transmitter.
We use Audacity to clean up the audio. GQRX is used to record the signals which are filtered on the Pinetab with internal RTL-SDR. Audio processing/noise reduction done running Parrot Linux using Audacity.
We also touch on the fact all electronic devices give off their very own unique electromagnetic emissions which can act as device signatures (strength depends on shielding).
In the case of this video sometimes speaker wire not properly shielded (as is found in most PC's) can act as a radio transmitter antenna without user knowledge. Here I discovered a few frequencies broadcasting the audio live (.25 second delay for SDR modulation).
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Custom Routers/Secure/Private Nextcloud setups. I believe in the right to privacy as a basic human right (Universal Declaration Human Rights (#12))..
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TIMESTAMPS:
00:00 Introduction
00:36 Every Device has a unique signature
01:11 Example of Tempest capture
01:42 Side Channels
01:54 GQRX Remote Speaker Audio Recording
03:53 Video of remote signals
04:51 Cleaning up audio in Audacity
To clear up any misconceptions: the video from camera I needed the microphone for and you can slightly hear video audio in distance: the Audacity parts are the *pure* GQRX signals recording audio.
DEVICES/SOFTWARE USED TO MAKE THIS VIDEO:
Pinetab with internal SDR from: www.pine64.com
Video Made In KDENLIVE: https://kdenlive.org
Computer Video Editing Runs Parrot Linux www.parrotsec.org
#Pinetab #SDR #Pinephone #Pine64 #RTLSDR #Radio #HamRadio #Privacy #Security #Infosec
