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Secret code

Most of the data is on the frontof each bank card. First of all, the long card number attracts attention. The most common sequence of 16 digits, although there were 13-digit numbers earlier, and now you can also find a 19-digit number. Their decoding is quite simple.

Sberbank customers have cards with an 18-digit number, because this bank encrypts in two additional figures the region where the card was issued.

The first figure in the plastic card number means,to which payment system does it apply. All VISA cards have a number starting with "4", MasterCard for "5", and American Express for "3". If the card was issued by a non-credit organization, the number can start with other digits. "1" and "2" are different airlines, "3" are travel and entertainment organizations, "6" are merchandising companies, "7" is fuel, "8" is telecommunications enterprises, and "9" is state banknotes. The second, third and fourth digits in the room are the number of the bank that issued the plastic card. The fifth and sixth give additional information about this credit institution. All together, the first six digits in the card number are the so-called bank identifier or BIN.

If the bank issues a card for a long time, the numbers on the front side will be squeezed out. On express cards, they are applied with special paint.

The seventh and eighth digits in the card number are the designation of the bank's program, for which he issued a credit card.

Personal data

All other figures, except the last, giveindividual card number. In this case, it is formed according to a special algorithm, that is, for two successively created cards, the number will not differ only by one figure - it will in general be unique. The last figure in the room is the control number. For the sake of curiosity, to check its correctness is easy on its own. To do this, you need to write out all the even numbers in the seven-digit card number separately, double them and add the result. Then add to them all the odd numbers of the number. If the result is a two-digit number, it is necessary to summarize the figures from which it consists. In addition, the front side of the plastic card indicates the validity period: the month number and the last two digits of the year are indicated through a slash.

Security issue

On the reverse side of the plastic cards are indicated inDepending on their type, the seven-digit card number or the last four digits of the number. In addition, it has three more digits - CVC code. These data allow you to make online payments. Scammers need only remember all the numbers that are printed on a plastic bank card to take advantage of other people's money without even stealing the card itself. That's why bank and law enforcement officials recommend not giving credit cards to other people, and all the operations that sellers or waiters do, personally monitor.