Specifications

Smart Cards Lab COMPGA12 University College London
15.3 Decoding Service Code - 3 Digits
D1: Interchange and technology.
D2: Authorization processing.
D3: Range of goods and PIN requirements.
Example:
Glossary:
RFU = Reserved for Future Use,
IC = Intergrated Circuit, or chip
when feasible = each time the terminal accepts it, if the chip is broken or
missing the financial transaction should not be handled
Note: We see that second LS bit of D1 indicates that the chip is present
and must be used. Ross Anderson reported that by modifying this code one
could with certain terminals circumvent the chip and make the card much
easier to clone.
c
Nicolas T. Courtois 2009-10