Indeed, this is not a new idea. The news here is about particular implementation for extracting passwords from QWERTY keyboards. That said, this is not a big p

Indeed, this is not a new idea. The news here is about particular implementation for extracting passwords from QWERTY keyboards. That said, this is not a big problem for ATM pin pads with metal keys, because these conduct heat well and so a heat pattern is hard to detect after few seconds. See: https://www.youtube.com/watch?v=PJCfTlQ82Fw https://www.youtube.com/watch?v=PJCfTlQ82Fw