By: Malathi

Absence of uniqueness has been a huge question mark & I thought that this has been a black box to me as I did not get clear answers. Thanks to Steve Sommers on throwing light. There are many ways by which this can be achieved. As we move towards chip & pin transactions, one quick suggestion could be card number combined with card transaction counter (CTC). Would ISO include this or other as an enhancement to 8583? This uniqueness will make a lot of sense to payment industry.