Validating credit card number length

22-Jun-2018 05:21

So having 12 digit account number means each card issuer could have 10^12 or 1.000.000.000.000 account number. The last digit is check digit, to calculate this check digit we use Luhn Algorithm This algorithm is also known as modula10 or mod10 algorithm Example: What is card type, issuer identifier and check if this card number is valid 4408 0412 3456 7890 Solution: 1. After that we append all of them 8 0 0 2 6 10 14 18 ^ ^ ^ -- to process on step 3 Hence we have: 4 8 4 2 4 6 8 0 = 36 Step 4: Add the values calculated in step 2 and step 3 together We have 31 36 = 67 Step 5 : Take the value calculated in step 4 and calculate the remainder when it is divided by 10.

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The most frustrating aspect of these unauthorized charges? Banks usually end up eating the cost of fraud from unauthorized transactions when scammers counterfeit and use stolen credit cards.

Even so, a bank may be able to recover some of that loss through dispute mechanisms set up by Visa and Master Card, as long as the bank can show that the fraud was the result of a breach at a specific merchant (in this case Home Depot).

However, banks are responsible for all of the fraud costs that occur from any fraudulent use of their customers’ chip-enabled credit/debit cards — The bank I first heard from about this fraud — a small financial institution in New England — battled some 0,000 in fraudulent charges from Brazilian stores in less than two days beginning last week.

The fraud expert with the New England bank said the institution had decided against reissuing customer cards that were potentially compromised in the five-month breach at Home Depot, mainly because that would mean reissuing a sizable chunk of the bank’s overall card base and because the bank had until that point seen virtually no fraud on the accounts.

“We saw very low penetration rates on our Home Depot cards, so we didn’t do a mass reissue,” the expert said.

The most frustrating aspect of these unauthorized charges? Banks usually end up eating the cost of fraud from unauthorized transactions when scammers counterfeit and use stolen credit cards.

Even so, a bank may be able to recover some of that loss through dispute mechanisms set up by Visa and Master Card, as long as the bank can show that the fraud was the result of a breach at a specific merchant (in this case Home Depot).

However, banks are responsible for all of the fraud costs that occur from any fraudulent use of their customers’ chip-enabled credit/debit cards — The bank I first heard from about this fraud — a small financial institution in New England — battled some 0,000 in fraudulent charges from Brazilian stores in less than two days beginning last week.

The fraud expert with the New England bank said the institution had decided against reissuing customer cards that were potentially compromised in the five-month breach at Home Depot, mainly because that would mean reissuing a sizable chunk of the bank’s overall card base and because the bank had until that point seen virtually no fraud on the accounts.

“We saw very low penetration rates on our Home Depot cards, so we didn’t do a mass reissue,” the expert said.

Digits 7 to final number minus 1 (the last is the checksum) indicate the individual account identifier. The only risk is if anyone is literally looking at your screen while you use the website.