On the back of each credit card, two sets of numbers are usually displayed in italics at the top of the signature. The first four digits are the last four digits of the card number. The last three digits are commonly known as "the last three digits". It is a verification code set by Bank of Communications to ensure the security of credit card passwords, and it is used for indirect credit card consumption transactions for bank cards. For example, online payment and other transactions, so the "last three yards" of the credit card cannot be leaked.
In addition to the password, credit card number, credit card expiration date, credit card use verification code CVN2 (last three codes) and ID number are also extremely important personal information, which can be used for remote non-face-to-face transactions such as air tickets, business trips, hotel reservations, etc. Don't disclose them easily.
Extended data:
definition
Credit card security: code, which is a set of 3 or 4 digits on the credit card. Its generation method is that the bank extracts the account number, validity period and service code of the card, arranges them and then calculates them through a series of complicated algorithms. After this set of numbers is generated, only the issuing bank and the holder of the bank card know what this number is. ?
Main uses:
Credit card security code is equivalent to credit card ID card, which can be used for consumer transactions. You don't need a password to shop on overseas websites. As long as the buyer provides the account number and security code, the transaction can be completed. In China, there are also merchants signing contracts with banks, but you don't need a credit card password, you only need a security code to complete the telephone transfer. Be sure to take good care of your credit card, and don't let it leave your sight when you consume it, so as to avoid others remembering your credit card account number and security code.
Baidu encyclopedia-credit card security code