I just joined this forum but i have been doing alot of reading. I found that one way to crack them is a brute force attack. The only problem is after i ran it through some problems, I found that you would need a processor that can handle 92.5 trillion charachters per second in order to perform this action. And the connection between your phone and computer would have to handle it as well as the phone itself. But to write a card generator would be very difficult because of the fact that a card does not work until scanned. Unless someone can make a scanner for them. I have some upc reading hardware if anyone thinks they might be able to do this.