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A random photo on the net probably doesn't have the resolution needed for Iris recognition

The CCC used an old digicam at medium distance. It is quite likely that such a photo is on FB, Instagram etc.

Side note: The CCC even recovered the fingerprint of the Germany's defense minister from a photo: https://www.theguardian.com/technology/2014/dec/30/hacker-fa...

Yeah then Samsung's "iris recognition" is more like "iris blur matching"

They also used the IR mode of a digicam. That hack is not possible from existing photos only, I think.