Anonymous wrote:
how PIN is checked? I've read somewhere on forum that PIN could be checked offline too.
I've seen tons of info on Google, all from around 1998. You should search better
pin scheme uses DES or 3DES encryption (one bank has one key), with pin offset in track 2, and it checks leftmost four chars. Noone knows DES key, even in a bank - parts of key are split between two or three employees' brains, and the key can be found in clear only in banking computer memory. They also change their key frequently.