Disconcerting suggestion.
Via Schneier, see where there are comments of interest ....
Credit card PINs can be guessed even when covering the ATM pad in Bleepingcomputer
By Bill Toulas
Researchers have proven it’s possible to train a special-purpose deep-learning algorithm that can guess 4-digit card PINs 41% of the time, even if the victim is covering the pad with their hands.
The attack requires the setting up of a replica of the target ATM because training the algorithm for the specific dimensions and key spacing of the different PIN pads is crucially important. .... '
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