we have a ATM system in which we use TMK and TPK for the pin encryption process.
and Pinblock is generated by encrypted keypad.
and for generation of pinblock we give 32 bit cipher input.
Cipher key input holds TPK Index + customer card number+ LRC as input
Once the pinblock is derived i really don't know how it is verified and i really want to learn how decryption process is done.
** When i see the reference manual i don't see anywhere where it used 16 digit card number is used for generating a PinBlock.
in general i see 12 Digit account number is used ( am very much noob sorry if i am wrong anywhere)
so with generated pinblock from ATM device which does not have the customer's account number in it how it is verified.
Please guide
and Pinblock is generated by encrypted keypad.
and for generation of pinblock we give 32 bit cipher input.
Cipher key input holds TPK Index + customer card number+ LRC as input
Once the pinblock is derived i really don't know how it is verified and i really want to learn how decryption process is done.
** When i see the reference manual i don't see anywhere where it used 16 digit card number is used for generating a PinBlock.
in general i see 12 Digit account number is used ( am very much noob sorry if i am wrong anywhere)
so with generated pinblock from ATM device which does not have the customer's account number in it how it is verified.
Please guide