After the last 4 digits of the card number on the signature line on the back. The security code for Hebei Bank cards is called CVN2, which is a 3-digit number printed flat on the signature line on the back of the credit card after the last 4 digits of the card number. The main function of the bank card security code is to verify the identity of the cardholder and prevent the bank card from being stolen. Only credit cards will set security codes. Hebei Bank was established on May 28, 1996. It is one of the first five pilot urban cooperative banks in the country and the earliest urban commercial bank established in Hebei Province. It provides Hebei Province and even the Bohai Rim region with sufficient capital, strict internal control, and excellent assets. A modern joint-stock commercial bank with good profitability and important market influence.