Tag Info

New answers tagged

0

Does it really mean "PIN OK"? In the sense that you entered the correct PIN? My bank uses a similar system. I put the card in the reader, enter my PIN. The bank gives an 8 digit code which I enter in the reader. The reader gives a 8 digit code back. It does not need to know if the entered PIN is correct to generate this code. If I enter the wrong PIN, it ...


3

If your debit card has an EMV chip (almost all chips are based on EMV today), it very likely does know your PIN (or at least how to verify an entered PIN). Whether that capability is actually used depends on the type of transaction and terminal; if the terminal is online capable, it might as well verify the PIN directly with your bank's servers, which also ...


0

It is likely that the 8 digit code is mathematically related to your pin (i.e. the sum of a certain hash of both arrives at a predefined static value) so that the 8 digit code can serve as a challenge and a way to validate your PIN. One possible way to find out more about the Digipass sequence is to try entering random (presumably incorrect) 8 digit codes: ...


7

The card knows this, the reader doesnt. When you put a pin in the reader talks to the microcontroller on the card to verify - which also logs the incorrect attempts. So multiple readers wont help trying to guess somebodies pin! Thats more or less the extent of my knowledge, but an overview of how it works. The underlying protocols I have no knowledge of ...



Top 50 recent answers are included