Bank card CSC, or CardSecurityCode, is a credit card security code, also known as CVC or CVV, used to enhance cardholder identity verification when shopping online and over the phone. This is a string of numbers, usually printed on the back of the card. The number of digits varies depending on the card type. For example, American Express cards are on the front, MasterCard and Visa cards are on the back, and Chinese and French bank cards have three and four digits respectively. .

The main function of CSC is to confirm the identity of the payer. When shopping online or paying over the phone, merchants will ask for the card number, expiration date and CSC to ensure that only the real cardholder can complete the transaction. Although CSC can improve security, it is not an absolute security barrier in itself. Once obtained by fraudsters, it may be used for illegal transactions. Therefore, it is crucial to protect your CSC, never write it on the card, prevent leaks, and check account security regularly.

Although security measures will continue to be upgraded with the development of technology in the future, the flaw of the CSC code is that it may be used for fraud, which cannot be completely eliminated unless multiple protective measures are taken. In general, CSC code is an important tool to ensure the security of bank cards. We need to understand how to use and keep it correctly to reduce potential risks and ensure the safety of funds.