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As each surveillance technique falls in price, it can be layered with other signal sources. Today, gr-tempest can recreate monitor images from HDMI RF emission

As each surveillance technique falls in price, it can be layered with other signal sources. Today, gr-tempest can recreate monitor images from HDMI RF emissions, using a low-cost SDR, https://twitter.com/markopolophys/status/1459911025642414086 https://twitter.com/markopolophys/status/1459911025642414086. GNU Radio conference video: https://www.youtube.com/watch?v=QRycX0M0H4s https://www.youtube.com/watch?v=QRycX0M0H4s. TEMPEST techniques have been known for decades, but only recently became accessible to pen-testers via OSS code and low-cost hardware, https://en.wikipedia.org/wiki/Tempest_%28codename%29 https://en.wikipedia.org/wiki/Tempest_%28codename%29 & https://en.wikipedia.org/wiki/Van_Eck_phreaking https://en.wikipedia.org/wiki/Van_Eck_phreaking. In 2024, 802.11bf Wi-Fi 7 Sensing with mmWave radar could see through home/business walls to monitor keyboard typing, human heartbeats and other activity. While attackers can use custom radio firmware today, WiFi 7 will bring "X-Ray Vision" to consumers, ready or not, unless nation-state spectrum regulators intervene. https://news.ycombinator.com/item?id=30172647 https://news.ycombinator.com/item?id=30172647. If a neighbor buys a Wi-Fi 7 Sensing device, they could monitor human activity through your walls. Intel (2020) presentation on Wi-Fi 7, slides #19 and #20 describe Wi-Fi Sensing, https://www.intel.com/content/dam/www/public/us/en/documents/pdf/wi-fi-7-and-beyond.pdf https://www.intel.com/content/dam/www/public/us/en/documents...

kibwen 4y ago
Incidentally, it sure would be a shame if using plaster for home interiors came back into fashion, since the metal lath acts as an effective Faraday cage.
- transpute 4y ago
  Thanks for the reminder :) Would also need grounding and ideally, continuity across corners and joins. Some photos of metal lath: https://inspectapedia.com/interiors/Plaster_on_Expanded_Metal_Lath.php https://inspectapedia.com/interiors/Plaster_on_Expanded_Meta...
- cma 4y ago
  Wouldn't the wire mesh need to be spaced near the size of the wavelength (mm-wave, so the wire mesh is probably way too spaced out)?
  - transpute 4y ago
    Wi-Fi 7 Sensing works at each of the different frequencies (2.4Ghz, 5Ghz, 6Ghz, 60Ghz). The lower frequencies have lower imaging resolution, longer range/penetration and can be blocked with less dense mesh. EMF shielding materials readily available at hardware stores include insect screening metal mesh and aluminum vapor or radiant barrier. There's also drywall which includes RF shielding, but it's expensive. DIY pointers: https://mpkb.org/home/special/emf/whitezones/faradaycage https://mpkb.org/home/special/emf/whitezones/faradaycage

kibwen 4y ago

Incidentally, it sure would be a shame if using plaster for home interiors came back into fashion, since the metal lath acts as an effective Faraday cage.

transpute 4y ago
Thanks for the reminder :) Would also need grounding and ideally, continuity across corners and joins. Some photos of metal lath: https://inspectapedia.com/interiors/Plaster_on_Expanded_Metal_Lath.php https://inspectapedia.com/interiors/Plaster_on_Expanded_Meta...
cma 4y ago
Wouldn't the wire mesh need to be spaced near the size of the wavelength (mm-wave, so the wire mesh is probably way too spaced out)?
- transpute 4y ago
  Wi-Fi 7 Sensing works at each of the different frequencies (2.4Ghz, 5Ghz, 6Ghz, 60Ghz). The lower frequencies have lower imaging resolution, longer range/penetration and can be blocked with less dense mesh. EMF shielding materials readily available at hardware stores include insect screening metal mesh and aluminum vapor or radiant barrier. There's also drywall which includes RF shielding, but it's expensive. DIY pointers: https://mpkb.org/home/special/emf/whitezones/faradaycage https://mpkb.org/home/special/emf/whitezones/faradaycage