Classic Electronics Smart 4F Especificaciones descargar pdf (Pagina 44)

Smart Cards Lab COMPGA12 University College London

One needs also to know how to encode the PIN and the special padding

that extends it to 8 bytes.

The encoding is somewhat strange, we simply write the decimal PIN as

text, treat it as a hex number, 4 digits makes 2 bytes, then we prepend ’24’,

and append ﬁve times ’FF’. Thus we get 8 bytes.

VERIFY CHV with DF-speciﬁc password (P2=80)

CLA INS P1 P2 Lc DataIn

00 20 00 80 08 24 (PIN in text) FF FF FF FF FF

The answer will be:

If the PIN is correct, the answer should be 90 00.

Please don’t try to ﬁnd out what is the answer when the PIN is in-

correct. This is very risky. If the PIN is already blocked, the answer is:

SW1 SW2

69 84

This bank card will not work anymore.

If the PIN is incorrect, but we have still several cardholder veriﬁcation

attempts left, the answer will be:

SW1 SW2

63 C

Where is the number

of PIN attempts left before the card will block itself forever.

Remark: From this we see that current bank cards have the capacity

to process at least twice longer PINs than commonly used (could be also be

longer with a better encoding). However very few banks use longer PINs.

Nicolas T. Courtois 2009-10

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Classic Electronics Smart 4F Especificaciones Pagina 44