Credit card security code Cvv2 is the security code of credit card when conducting online or telephone transactions. It is 3 or 4 digits printed on the credit card. Different types of cards have different printing positions. It is usually used to prove that the payer has a credit card when making a transaction, thus preventing credit card fraud.
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.
Print position of Cvv2 code
The security code of VISA card is called CVV2 (card verification value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.
MarsterCard's security code is called CVC2 (Card Verification Code 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.
The security code of Discover card is called Cardmember ID, which has 3 digits and is printed on the signature column on the back of the credit card.
The security code of American Express is called CID (Card Identification Number), which has 4 digits and is printed on the front of the credit card above the credit card number.
The security code of China UnionPay is called CVN2 (card verification number 2), which has 3 digits and is printed after the 4 digits of the card number on the back of the credit card.
The security code of JCB card (Japan Credit Bureau) is called CAV2 (card authentication value 2), which has 3 digits and is printed on the back of the credit card number.
Refer to the above content: Baidu Encyclopedia -CVV QR code