army1987 comments on [LINK] Using procedural memory to thwart "rubber-hose cryptanalysis" - Less Wrong
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I've heard of some kind of security system whereas you can enter either the usual password or a “special” one, and if you enter the latter you're granted access but the police are alerted, or something like that.
The extension to that to an ATM might be one which gives fake bills, takes a picture, and alerts the police if the “fake” PIN is input.
For ATMs, the idea is out there, but it has never been implemented. Snopes on this: