An even more sinister approach would be to use an infrared meter a couple of sec... | Hacker News

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		Kafka on Sept 23, 2009 \| parent \| context \| favorite \| on: Why you should use four different digits for keypa... An even more sinister approach would be to use an infrared meter a couple of seconds after someone just touched the keypad.

tesseract on Sept 24, 2009 [–]

I wonder whether any of the FLIR imagers that are currently commercially available and reasonably portable are sensitive enough to make this work. Any links?

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