tag:blogger.com,1999:blog-125341290284114978.post7195566839388522961..comments2023-04-23T00:05:10.829-07:00Comments on Guy Ellis' Tech Blog: Are there enough credit card numbers?Guy Ellishttp://www.blogger.com/profile/02574435376236977220noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-125341290284114978.post-57035700442921842742008-09-03T02:23:27.000-07:002008-09-03T02:23:27.000-07:00@Paul - you're correct. There's also an al...@Paul - you're correct. There's also an algorithm called the Luhn's Algorithm that allows you to quickly calculate if a series of 16 digits could possibly be a credit card. Did you know that if you randomly generated a 16 digit number that it has a 10% change of passing the Luhn Test?guy ellisnoreply@blogger.comtag:blogger.com,1999:blog-125341290284114978.post-22360042269161723092008-08-04T17:51:53.000-07:002008-08-04T17:51:53.000-07:00An interesting thing is the credit cards are coded...An interesting thing is the credit cards are coded based on backing company, issuing bank... For example all discover cards start with a 6. Master Card is 5, I beleive.Paulnoreply@blogger.comtag:blogger.com,1999:blog-125341290284114978.post-52897499065153952572008-07-26T15:25:32.000-07:002008-07-26T15:25:32.000-07:00I'm not really that tall - I'm just sittin...I'm not really that tall - I'm just sitting on my credit cards!Rob Mandersonnoreply@blogger.com