Re:Spy camera detection using smartphone time-of-flight sensors
by pishpash on Thursday November 18, 2021 @08:32PM
(#29272804)
Then they'd have a signature of reflecting less than surrounding. In the long long run, probably more robust to detect the entropy generated by computation in a physical area (i.e. heat) and not the optics.
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Re:Spy camera detection using smartphone time-of-flight sensors
by frizensami on Friday November 19, 2021 @07:46AM
(#29276593)
Agreed. I expect however that any easily available thermal sensing, especially on smartphones (see FLIR, etc), could be easily defeated with a strong adversary doing good thermal management.
As you say though, extra heat is a physical guarantee, so maybe a smarter technique exists to separate signal from noise in the thermal domain that I don't know of yet.