Cracking the Credit Card Code

VSIA CRACKING CREDIT CARD CODE Big Bank u'u17 1234 5678 9113 VALID 8/11 LEE M CARDHOLDER VISTA The first digit is the Major Industry Identifier. It designates the category of the entity which issued the card. The 7th and following digits, excluding the final digit, are the person's account number. This leaves a trillion possible combinations if the maximum of 12 digits is used. Many cards only use 9.digits. and 2 are Airlines. 3 is Travel and Entertainment and 5 are Banking and Financial 6 is Merchandizing and Banking 7 is Petroleum 8 is Telecommunications 9 is National assignment The final digit is the check digit or checksum. It is used to validate the credit card number using the Luhn algorithm. The first 6 digits are the Issuer Identification Number. It will indentify the institution that issued the card. How to Validate a Credit Card With Your Mind Visa: 4xxxxx Mastercard 51xxxx - 55xxXx Discover: 6011xx, 644xxx, 65xxx Amex: 34xxxх, 37хххх Cards can be looked up by their IIN. A card that starts with 376211 is a Singapore Airlines Krisflyer American Express Gold Card. 529962 designates a pre-paid Much- Music MasterCard. Take the above number (or any credit card number) 4417 1234 5678 9113 And double every other digit from the right. 4417 1234 5678 9113 x2 x2 x2 x2 x2 x2 x2 x2 82 2 6 10 14 18 2 4 7 2 4 6 8 Add these new digits to undoubled ones. All double digit numbers are added as a sum of their digits, so 14 becomes 1+4. 8+4+2+7 + 2+2+6+4 + ]+O+6+1+4+8 + 1+8+1+2+3 =70 If the final sum is divisble by 10, then the credit card number is valid. If it's not divisible by 10, the number is invalid or fake. Try it and see. byJess.Net mint.com/blog