The credit card security code is equivalent to the credit card’s ID card. We can use this code to conduct consumer transactions.

Credit card security code is a security code for credit cards when conducting online or telephone transactions. It is usually a 3 or 4-digit number printed on the credit card, and the location of the printing will vary on different types of cards. It is often used to prevent credit card fraud by verifying that the payer owned the credit card at the time of the transaction.

The method for generating credit card security codes is that the bank extracts the card account number, validity period, and service code, arranges them, and then calculates them through a series of complex algorithms. After this set of numbers is generated, only the issuing bank and the bank card holder know what the number is.

Extended information:

Credit Card, also called credit card. It is a non-cash transaction payment method and a simple credit service.

A credit card is a credit certificate issued by a commercial bank or credit card company to consumers with qualified credit. Consumers holding credit cards can shop or consume at specially appointed commercial service departments, and then the bank will make settlements with merchants and cardholders. Cardholders can overdraft within the prescribed limit.

Reference: Baidu Encyclopedia-Credit Card Security Code