3 ms·
> Maybe you can force the measurement device to move only in one direction, but if I were to design the ATM, it would detect inconsistent, physical card movemen
by LeonM 8y ago
> Maybe you can force the measurement device to move only in one direction, but if I were to design the ATM, it would detect inconsistent, physical card movement.
That would be very prone to false positives. Weather variations (temperature, humidity), card types, dirt (grease , dust) and foreign objects (stickers on the card) etc etc would all make the card movement inconsistent.
- archi42 8y agoI don't think so. If you don't know how it moves, you can not read meaningful data (if it moves forward/backward). That's the whole point of that counter measure. If they [the ATMs] do this and can read the card, then they can also check that the measured movement matches what the controller sent to the motor driver. Heck, depending on the driver they could just let it measure back EMF (e.g. some Trinamic stepper drivers can do that).