The last three digits of the credit card signature column are called CVV2 verification code, and different types of credit cards will be printed in different locations. The main function is to prove that the payer has a credit card at the time of transaction, thus preventing the credit card from being used by++.

CVV2 password verification means that commercial banks add the verification code of self-defined algorithm to the bank ++ coding rules and magnetic stripe data formats they use, and the related bank cards are also called CVN bank cards. The generation method of CVV2 verification code is that the bank extracts the card account number, validity period and service code, arranges them and then calculates them through a series of complicated algorithms. Generally, only cardholders and banks know the CVV2 verification code, and users can't disclose the CVV2 verification code privately, otherwise the credit card will be stolen.

Some overseas shopping websites do not need the user to enter the payment password, but only need the cardholder's account number and CVV2 code to complete the payment. In China, there are also businesses and banks that cooperate with each other. You don't need a credit card password, but only need a security code to complete the telephone transfer. CVV2 verification code and bank card password are the same security mechanism. If the user enters the wrong CVV2 verification code three times in a row in the same day, the credit card will be locked. However, the credit card will be automatically unlocked the next day. CVV2 code is a very important security code. In order to prevent others from obtaining the CVV2 code, users should remember the CVV2 code and erase it.

How to sign the back of China Bank's credit card?

Please sign your name in the signature field on the back of the card.

The above contents are for your reference. Please refer to the actual business regulations.

If you have any questions, please contact online customer service of Bank of China.

You are cordially invited to download and use China Bank Mobile Banking APP or China Bank Cross-border GOAPP to handle related business.

Where is the credit card signature column?

The signature column of a credit card is the middle part of the back of the credit card, where you can write fonts. Sign it.

What are the last three digits in the signature column after the credit card?

The last three digits of the signature column after the credit card are the credit card security code.

The credit card security code is a set of 3 or 4 digits on the credit card. Its generation method is that the bank extracts the account number, validity period and service code of the card, arranges them and then calculates them through a series of complicated algorithms. After this set of numbers is generated, only the issuing bank and the holder of the bank card know what this number is.

Extended data:

Generation algorithm:

CVV password verification means that commercial banks add the verification code of self-defined algorithm to the bank ++ coding rules and magnetic stripe data formats they use, and the related bank cards are also called CVN bank cards.

CVV information is stored in the track of a magnetic stripe bank card, and encrypted by a special encryption algorithm defined by each bank according to information such as++number, track master account number, issuer identification code, etc.

Every step is encrypted by CVKA technology, and the verification code is obtained. Because the encryption algorithms of different banks are different, some fake cards illegally made by using the obtained bank card information can be identified and cannot be used when the issuing bank decrypts them.

Main uses:

The credit card security code is equivalent to the credit card ID card, and we can use this code for consumer transactions. You don't need a password to shop on overseas websites. As long as the buyer provides the account number and security code, the transaction can be completed, and there are also merchants and banks signing contracts in China.

You don't need a credit card password, you only need a security code to complete the telephone transfer. Therefore, everyone must take good care of their credit cards, and don't let them leave their sight when spending, so as to avoid others remembering your credit card account number and security code.

Baidu encyclopedia-credit card security code

The introduction of the credit card signature column ends here.