The security code of China Industrial and Commercial Bank UnionPay credit card, namely CVN2, is located in the last three digits of the credit card signature column, which plays a vital role in off-site transactions. This security code is like the personal identification of a credit card, which ensures the safety of the consumption process. Whether shopping on overseas websites or making some domestic phone calls, as long as the credit card number and security code are provided, the transaction can be completed without entering a password.

however, this does not mean that you can freely disclose or let the credit card out of sight. It is an important step to keep the security code properly and ensure that it will not be obtained by others. It is worth noting that the names and printing positions of security codes of different credit card organizations are different. For example, CVV2 of VISA is printed in the last four digits of the card number, and CVC2 of MasterCard is also in the same position. The names and locations of security codes like Discovery Card, American Express Card and JCB Card also have their own characteristics.

complex encryption algorithm is used to generate the security code, which is encrypted through the specific coding rules and formats of bank card information and the bank's self-defined algorithm. This encryption mechanism makes it possible that even if some bank card information is obtained, the illegally made fake card may be identified at the issuing bank and cannot be used.

To sum up, the security code of China Industrial and Commercial Bank UnionPay credit card is a key element to ensure your consumption safety. Please keep it properly and ensure the confidentiality when using it in transactions.