But you basically can't do anything with a credit card number anyway--there doesn't seem to be much point breaking a long number into 10+ shorter numbers with d

But you basically can't do anything with a credit card number anyway--there doesn't seem to be much point breaking a long number into 10+ shorter numbers with different security requirements if you need all of the numbers all the time to do anything anyway. It's not like I can make purchases under $5 with just a CC number, but for larger purchases I have to provide more information.