Just like there was a relatively cheap countermeasure to every pipe dream revision of the SDI, such countermeasures are already in place for facial recognition:
Those aren't even the interesting countermeasures. Good work with makeup can significantly change the structure of your face, completely reversibly, far more than is necessary to fool these systems running across the full set of human beings. You don't have to get the face recognizer to not recognize a face at all, you just have to make it a wrong face.
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Just like there was a relatively cheap countermeasure to every pipe dream revision of the SDI, such countermeasures are already in place for facial recognition:
http://news.discovery.com/tech/gear-and-gadgets/glasses-foil...
But at least we'll fall victim to a higher, rarified caliber of terrorist rather than that awful riffraff we're dealing with now.
Those aren't even the interesting countermeasures. Good work with makeup can significantly change the structure of your face, completely reversibly, far more than is necessary to fool these systems running across the full set of human beings. You don't have to get the face recognizer to not recognize a face at all, you just have to make it a wrong face.