Card readers bewilder me.
I can understand how a card reader might be able to generate one set of number when another series is entered, if the correct chip is within the reader.
I do not understand how a card reader can tell that I've just entered the correct pin, and then generates its series of numbers.
Do those little gizmos have some sort of comms system built in?
My card doesn't store its pin, and my pin can be changed at any cashpoint, so how on earth can my card reader tell I've used the right pin?
Does it simply assume the pin is correct and generate a series of numbers based upon that?