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/
@indie @hummingrain The second one is not something i've heard of! the first one is used in the first chapter or so of Doctorow's Little Brother, but using the "more obvious" video surveillance + gait recognition software (not that obvious, even more so 10 years ago). Both are really neat though, I'd read that :)
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