Credit card security code is the security code of credit card for online or telephone transactions. Generally, it is a 3-digit or 4-digit number printed on a credit card, and the printing position of different types of cards will be different. It is usually used to prove that the payer has a credit card at the time of transaction, thus preventing credit card fraud. ?
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. ?
CVV password verification means that commercial banks add the verification code of self-defined algorithm to the bank card number coding rules and magnetic stripe data format they use, and the related bank cards are also called CVN bank cards. CVV information is stored in the track of magnetic stripe bank card. According to the information such as card number, track main account number and logo code of issuing bank, it is encrypted by special encryption algorithm defined by each bank, and every step is encrypted by CVKA technology to get verification code. 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. ?
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. In China, there are also merchants signing contracts with banks, but 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. ?
The credit card security code, like the CVV code, is the card verification value obtained by the same algorithm, except that when the card is generated, the CVV code is written into the magnetic stripe and the credit card security code is written on the card. ?
Check the CVV code when online transactions (swiping cards), and check the credit card security code more when off-site transactions or transactions without cards.
Enter the validity period to check whether the credit card has expired, and the expired credit card cannot be recharged.