3 ms·
How many bit of entropy are in a credit card? I ran the numbers a few years ago but don't remember now. Well within a very small rainbow table in any case.
by mentat 11y ago
How many bit of entropy are in a credit card? I ran the numbers a few years ago but don't remember now. Well within a very small rainbow table in any case.
- CiPHPerCoder 11y agoYou have 10^15 possible values from a 16-digit CC number (due to Luhn's algorithm). The first 6 are for the issuer/bank; if you know that, you have 10^9 or about 30 bits of possible values.