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Indeed. I'm confused by this line from the article

> a study with 197 participants, the team could infer the identity of persons with almost 100% accuracy – independently of the perspective or their gait.

The paper seems to make it clear that the technique still depends on gait analysis, but claims it's more robust against gait variations.

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The paper also makes clear they had no success correlating across different perspectives- welcome to science reporting.
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It feels rather more than a little bit creepy to realize that Comcast et al, and thus the US government (if you live there), laundered through 3rd party data brokers, knows if you're sleeping and knows if you're awake. Knows if you've been bad or good, for ICE/ATF/DEA/SEC's sake.
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Comcast is late to the party, then. AT&T has been selling your information for decades. And your mobile provider can track you anyplace that there's a cell-signal, potentially even outside the country.
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[flagged]
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