The cvv2 of a credit card is also called the security code. It is the security code of the credit card when swiping the card for payment. If you don’t know where the ccv2 code is, you can open the signature on the back of the credit card. The last three digits in italics are ccv2 code.

Add the verification code (CVN) of the custom encryption algorithm into the bank card number encoding rules and magnetic stripe data format used. The relevant bank card is also called a CVN bank card, and the CVV information is stored in The magnetic stripe bank card's magnetic track contains information such as the card number, the main account number on the track, and the logo code of the issuing bank.

Extended information:

Notes on using CVV:

The credit card number, validity period, 3-digit CVV security code on the back of the card, etc. can complete the transaction, CVV The security code is equivalent to the second password of a credit card. After opening the card, the cardholder may wish to cover the CVV code on the back with a sticker, do not borrow the card, keep the card out of his sight when swiping the card, and do not provide card information to others, etc.

As for the risk issue, because this type of transaction is not a credit card transaction based on a password, if there is a theft due to information leakage due to no fault of the customer, the bank's lost card protection has a certain probability of compensation.

What is particularly worth mentioning is the transaction security guard of the Guangfa Bank Credit Card Center. The protection scope not only includes the protection of lost cards by peers, but also includes stolen transactions through password verification. It is the only and first in the credit card industry to have A bank credit card center with comprehensive fund protection services.

Baidu Encyclopedia-cvv