The last three digits of the credit card signature field

The last three digits of the credit card signature field are called CVV2 verification codes. Different types of credit cards will be printed in different locations. The main function is to verify that the payer is in the transaction. when you own the credit card, thereby preventing Credit Card++.

CVV2 password verification means that commercial banks add custom algorithm verification codes to the bank++ encoding rules and magnetic stripe data formats they use. The relevant bank cards are also called CVN bank cards. The CVV2 verification code is generated by the bank extracting the card account number, validity period, and service code, arranging them, and then calculating them through a series of complex algorithms. Generally, only the cardholder and the bank know the CVV2 verification code. Users are not allowed to leak the CVV2 verification code privately, otherwise credit card theft will occur.

Some overseas shopping websites do not require users to enter a payment password, and only require the cardholder’s account number and CVV2 code to complete the payment. Domestic merchants also cooperate with banks and can complete phone transfers without a credit card password and only a security code. The CVV2 verification code is the same security mechanism as the bank card password. If the user enters the wrong CVV2 verification code three times in a row on the same day, the credit card will be locked. However, the credit card will be automatically unlocked the next day. The 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 then erase it.

How to sign on the back of a Bank of China credit card?

Sign your name in the signature field on the back of the card.

The above content is for your reference, please refer to actual business regulations.

If you have any questions, please feel free to consult Bank of China’s online customer service.

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

Where is the credit card signature line?

The credit card signature line is the place where you can write on the middle part of the back of your credit card. Just sign on it

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

The last three digits in the signature column on the back of 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. The generation method is that the bank extracts the card account number, validity period, and service code, arranges them, and then calculates them through a series of complex algorithms. After this set of numbers is generated, only the issuing bank and the bank card holder know what the number is.

Extended information:

Generation algorithm:

CVV password verification refers to the bank++ encoding rules and magnetic stripe data format used by commercial banks. By adding the verification code of the custom algorithm, the relevant bank card is also called a CVN bank card.

CVV information is stored in the magnetic track of the magnetic stripe bank card, and is encrypted through a special encryption algorithm customized by each bank based on ++, track master account number, card-issuing bank logo code and other information.

Each step is encrypted using CVKA technology to obtain a verification code. Since the encryption algorithms of different banks are different, some counterfeit cards illegally produced using the obtained bank card information can be identified and cannot be used when the card issuer decrypts them.

Main purposes:

The credit card security code is equivalent to the credit card’s ID card. We can use this code to conduct consumer transactions. Shopping on overseas websites does not require a password. As long as the buyer provides an account number and security code, the transaction can be completed. In China, there are also merchants signing contracts with banks.

No credit card password is required, only the security code can be used to complete the transfer over the phone. Therefore, everyone must take good care of their credit cards and keep them out of their sight when making purchases to avoid others remembering your credit card account number and security code.

Baidu Encyclopedia-Credit Card Security Code

That’s it for the introduction of the credit card signature field.