Your phone's wifi signal can be used to identify your gait (way you walk). Your gait is unique enough that it can be used to identify you. If there is prior video footage of view, it can be matched to that too. Impressive research, scary implications https://nakedsecurity.sophos.com/2019/10/07/wi-fi-signals-let-researchers-id-people-through-walls-from-their-gait/
@axx You hardly even need anything this sophisticated most of the time. There are a ton of ways to identify cellphones uniquely via wifi, bluetooth, or the mobile signal itself. And most of the time it's trivial to link a cellphone to a person.
The signals can even be picked up from space using an antenna array and processing that's well within the budget of government spy agencies.
As far as I understand the article, it is not about using the Wifi signal of the phone's user, but rather to characterize the gait of anyone thanks to its impact on any Wifi radiation.
So, even if you are without any electronic device in your pocket, you can still be identified!
This is much more frightening than simply identifying you with the Bluetooth of your phone...
@axx @xavierluthi Incidentally, I think the only way to get people to give a shit about this stuff is to make the technique accessible to more than just governments. When it's not only available to a mysterious shadowy entity people can pretend either doesn't exist, doesn't care about them, or has less capability than it does (or more, if it's necessary to justify a fatalistic view), maybe people will pay more attention.