Excerpt from the article:

The researchers… call their approach “WhoFi”, as described in a preprint paper titled, “WhoFi: Deep Person Re-Identification via Wi-Fi Channel Signal Encoding.”

Who are you, really?

Re-identification, the researchers explain, is a common challenge in video surveillance. It’s not always clear when a subject captured on video is the same person recorded at another time and/or place.

Re-identification doesn’t necessarily reveal a person’s identity. Instead, it is just an assertion that the same surveilled subject appears in different settings. In video surveillance, this might be done by matching the subject’s clothes or other distinct features in different recordings. But that’s not always possible.

The author asserts that re-identification doesn’t necessarily reveal a person’s identity, although I suppose this is similar to how a single fingerprint or DNA sample doesn’t necessarily reveal a person’s identity, right up until somebody can connect your fingerprint to your identity, say, by correlating your location with other tracking methods or something.