Card Security Code is a security feature of credit cards when conducting telephone transactions or online transactions (the card cannot be swiped).

Although CVV2 and CVC2 have different names, the generation method is the same. The bank extracts the card account number, validity period, and service code, arranges them, and then calculates them through a series of complex algorithms.

As an ordinary credit card holder, we only need to protect the CVV2 and CVC2 security codes from being leaked.

Extended information:

1. The security code of the VISA card is called CVV2 (Card Verification Value 2). It has 3 digits and is printed flat on the signature line on the back of the credit card. The last 4 digits of the card number. at.

2. The security code of MasterCard is called CVC2 (Card Validation Code 2). It has 3 digits and is printed flat on the signature line on the back of the credit card at the last 4 digits of the card number.

Among them, the security code of Visa is called CVV2 (Card Verification Value 2); the security code of MasterCard is called CVC2 (Card Validation Code 2).

Reference materials:

Baidu Encyclopedia-Credit Card Security Code