Yes, you won't be able to do this on normal wifi traffic typically either, you need to send specific packets at a high enough rate (in between normal internet traffic) in order to sense with any accuracy, as I also remarked earlier: https://news.ycombinator.com/item?id=46976849
Yea, that makes sense as you would need quite a bit of information across a reasonable temporal range if the identifying qualities are movement related. Very interesting.
There'll be an update where a first responder can send a special packet to an SSID that will enable these high rate packets without needing to join the wifi. It'll be secure where only the good guys will know about it so that it won't be able to be used nefariously. /s
I was shocked to find that even electronics that are collected in Europe seem to be shipped to Africa, set on fire, and at most, metals are collected from the ashes, including traces of gold and copper. That's about it. Batteries have a bit better recycling path but not by much.
On the upside, at some point the ground in those infamous electronics "recycling" towns will become so contaminated they'll be able to strip-mine for rare earths!
A lot of recycling seems to amount to shipping waste overseas so it can be disposed of in jurisdictions with few/no environmental protections. Pretty sad state of affairs.
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 presence and movement in a defined space, but ideally requires you to cross the path between two mains-powered devices, such as light bulbs or wifi mesh points. Passing a cafe doesn't seem too likely.
If you want to do advanced sensing, trying to identify a person, I would postulate you need to saturate a space with high frequency wifi traffic, ideally placed mesh points, and let the algo train on identifying people first by a certain signature (combination of size/weight, movement/gait, breath / chest movements).
Source: I worked on such technologies while at Signify (variants of this power Philips/Wiz "SpaceSense" feature).
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 signal strength. RSSI is an aggregation of information that the researchers describe as "not robust" for fine-grained tasks
In contrast, BFI is a high-resolution, compressed representation of signal characteristics.
This rich data allows the system to distinguish between 197 different individuals with 99.5% accuracy, something impossible with basic RSSI.
While older CSI methods often focused on walking directly between a specific transmitter and receiver (Line-of-Sight), BFI allows a single malicious node to capture "every perspective" between the router and all its legitimate clients.
Also CSI requires specialized hardware and custom firmware, this one isn't, just wifi module in monitor mode.
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.
With the age of retirement (in europe) steadily increasing, and the workforce getting older, the typical corporate position of rejecting older candidates will need to change, if only simply to fill the vacancies. For this, the mentality of hiring managers and HR will need to change as well, and business school articles like this should help.
What’s more surprising is the fact that the seem comfortable letting go of 1700 people with knowledge of the company and processes.
Dutch government stepped in last year to help facilitate a anticipated growth by fast tracking infrastructure and housing investments, as ASML is building a new campus for 20.000 employees. Then do they expect the 1700 to wait and come back in 2-3 years when the new campus is planned to be operational?
One of the most startling differences between Chinese and European cities is the lack of grafitti in China. I wonder if it's explained by laws, norms, enforcement?
The TiO2 will likely rub off and need regular replenishment. Also, the alternative here, sensor-operated or button-operated automatic doors are already widely used. I wonder who this is meant for?
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