The CVV code is on the signature line on the back of the credit card. The CVV code is a 3-digit or 4-digit number generated from the card number, validity period and service restriction code. It is used to confirm that the payer actually owns the credit card at the time of transaction. It is something that bank staff cannot obtain from the industry system. The only character owned. CVV codes can be used to verify the authenticity of credit cards and effectively prevent fraud or credit theft.

Credit card security code is a security code for credit cards when conducting online or telephone transactions. It is usually a 3 or 4-digit number printed on the credit card, and the location of the printing will vary on different types of cards. It is often used to prevent credit card fraud by verifying that the payer owned the credit card at the time of the transaction.

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.

The security code of the VISA card is called CVV2 (Card Verification Value 2), which is a 3-digit number and is printed flat on the signature line on the back of the credit card at the last 4 digits of the card number.

CVV password verification means that commercial banks add custom algorithm verification codes to the bank card number encoding rules and magnetic stripe data formats they use. The relevant bank cards are also called CVN bank cards. CVV information is stored in the magnetic track of the magnetic stripe bank card. Based on the card number, track master account number, card-issuing bank logo code and other information, it is encrypted through a special encryption algorithm customized by each bank. Each step is encrypted using CVKA technology to obtain the verification code. .

Because 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. The credit card security code is equivalent to the credit card's ID card. We can use this code to conduct consumer transactions.

Passwords are not required for shopping on overseas websites. As long as the buyer provides an account number and security code, the transaction can be completed. In China, there are also merchants that sign contracts with banks, which can be completed without a credit card password and only with a security code. Pay by phone. Therefore, everyone must take good care of their credit cards and keep them out of their sight when making purchases to prevent others from remembering your credit card account number and security code.

The credit card security code and the CVV code are the same. They are card verification values ??derived from the same algorithm. However, when the card is generated, the CVV code is written into the magnetic stripe, while the credit card security code is written into the magnetic stripe. Got stuck. The CVV code is verified during online transactions (card swiping), while the credit card security code is verified more often during off-site transactions or card-not-present transactions.