WiFi could become an invisible mass surveillance system
171–180 of 199 posts
Re: WiFi could become an invisible mass surveillance system
#172You lost me at "these are formed using radio signals rather than light"
Re: WiFi could become an invisible mass surveillance system
#173Earlier quoted context omitted.
No this is fixed by physics. 5ghz waves are about 60mm wavelength. Your resolution limit is about 30mm as a result.
Add a nice prior from a photograph, combine multiple measurements and presto you can pick out a person from a crowd with reasonable accuracy. No?
It applies to the sensor size as well. Such as you need a 3m sensor to get 100px per radian, under ideal circumstances, unless I'm mistaken. (I think I'm not)
Re: WiFi could become an invisible mass surveillance system
#174Earlier quoted context omitted.
What happens is that a large body of water (pun intended) has the ability to absorb and reflect wifi signals as it moves through the room. For this you need to generate traffic and measure for instance RSSI or CSI (basically, signal strength) of the packets. If you increase frequency you can detect smaller movements such as arms moving vs. a body, or exclude pets if you reduce sensitivity. It works well for detecting…
You are confusing it with the earlier methods. This is similar but not the same method that doesn't use RSSI or CSI and it is passive. This approach relies solely on the "unencrypted parts of legitimate traffic". The attacker does not need to send any packets or "generate" their own traffic; they simply "listen" to the natural communication between an access point and its clients. BFI is much more complex than simple…
Thank you for adding this context of this particular research, I do see that it relies on MU-MIMO information, which does rely on more powerful WiFi infrastructure than the basic ESP32's I am referring to.
Re: WiFi could become an invisible mass surveillance system
#175"Could Become" ? https://hueblog.com/2025/09/23/step-by-step-guide-setting-up... https://hueblog.com/2025/12/01/next-step-for-hue-motionaware...
Sure, however as explained further in this thread the BFI approach is new as opposed to the courser Zigbee RSSI-based approaches of Hue MotionAware.
Re: WiFi could become an invisible mass surveillance system
#176related (2022): DensePose From WiFi https://arxiv.org/abs/2301.00250
Re: WiFi could become an invisible mass surveillance system
#177Earlier quoted context omitted.
Yeah, it can and will be refined, but the major limiting factor is resolution. Wi-Fi radio waves are just too big to get a very clear image.
like i mentioned in another comment, do you really need good resolution for gait analysis? You also have people carrying their phones inside the house all the time, so you know what bssid is associated with that coarse movement. and if you have access to their ap/router combo, you can tell what IP that device has and what domains it's been visiting. Let's say you visit a friend in a different city, the same ISP contr…
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Re: WiFi could become an invisible mass surveillance system
#178You'd have been mocked as a tinfoil hat wearer for saying this more than 18 months ago
Re: WiFi could become an invisible mass surveillance system
#179Earlier quoted context omitted.
like i mentioned in another comment, do you really need good resolution for gait analysis? You also have people carrying their phones inside the house all the time, so you know what bssid is associated with that coarse movement. and if you have access to their ap/router combo, you can tell what IP that device has and what domains it's been visiting. Let's say you visit a friend in a different city, the same ISP contr…
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The authorities know their IDs and fully support them
Re: WiFi could become an invisible mass surveillance system
#180reminder - there's tech out there that is capable of reading your thoughts. remotely. look up radiomyography