548
Humans can be tracked with unique 'fingerprint' based on how their bodies block Wi-Fi signals
(www.theregister.com)
this post was submitted on 25 Jul 2025
548 points (98.2% liked)
Technology
73287 readers
3959 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related news or articles.
- Be excellent to each other!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, this includes using AI responses and summaries. To ask if your bot can be added please contact a mod.
- Check for duplicates before posting, duplicates may be removed
- Accounts 7 days and younger will have their posts automatically removed.
Approved Bots
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Could be developed into a useful tool for search and rescue
You are correct because something similar has already been used
https://spinoff.nasa.gov/FINDER-Finds-Its-Way-into-Rescuers-Toolkits
Microwaves are the same as wifi waves, these are able to detect bodies and whether the bodies are beating or not
WiFi uses a subset of the significantly wider microwave band. Ground Penetrating Radar also uses a subset of the microwave band. While there can be some overlap, the frequencies desired for GPR will very broadly based on what you are looking for, what you are looking in, and how deep you are looking for that thing. The wattage supplied can also differ.
WiFi and Microwaves in general are most definitely not the same thing and I will absolutely encourage you to not set up a 1kW 3GHz jamming antenna for your WiFi needs.
Could you use WiFi for search and rescue? Maybe for a narrow set of circumstances, but in almost all situations a dedicated GPR option will be better.
This also won't identify a victim, only revealing that one exists.
Probably not.
This kind of thing relies on the fact that the emitter and environments are static, impacting the propagation of the signals in a predictable way and that each person, having a unique physique, consistently interferes with that propagation in the same way. It's a tool that reports "the interference in this room looks like the same interference observed in these past cases."
Search and rescue is a very dynamic environment, with no opportunity to establish a local baseline, and with a high likelihood that the physiological signal you are looking for has been altered (such as by broken or severed limbs).
There are some other WiFi sniffing technologies that might be more useful for S&R such as movement detection, but I'm not sure if that will work as well when the broadcaster is outside the environment (as the more rubble between the emitter and the target the weaker your signal from reflections against the rubble).
Don't think of this as being able to see through walls like with a futuristic camera, think of this as AI assisted anomaly detection in signal processing (which is exactly what the researchers are doing).
https://spinoff.nasa.gov/FINDER-Finds-Its-Way-into-Rescuers-Toolkits
Microwave based ground penetrating radar is actually different from WiFi. Also the technology referenced in the link is a motion based body locator, not an identity recognition device.
This is different technology doing different things than what the original article was talking about.
Being able to scan and model a 3D environment using wifi? Sure. Wifi-fingerprinting the people in the scan? Why?
I mean I don't understand this as a lay person, so if it doesn't work then fair enough, but if wifi signals can identify human beings, and pets, when a building collapses better than other methods, or even augment the capabilities already used, then at least there is some benefit from this technique. It's not going to disappear, Genie is out of the bottle now, so why not at least put it to a good use instead of keeping it only being abused by the billionaires and other evil entities.
It's too late now to stop that and I hate that they can do this.
Please don't mistake me trying to find a silver lining as anything other than trying to find a reason that this isn't just another way we are fucked but the science is what it is so out it to better use. It's an interesting capability regardless of how it can be abused, and since we aren't going to stop using the technology we should really understand exactly how this works by using it and making it was beneficial as possible.. Until we were ready to ban the tech, which I have no faith that we will ever.
A bespoke device made to do this, not just your wifi router at home, might as well study it for good praises, or we may if only be abused with little defence against our collective abusers