CVV password verification refers to the verification that commercial banks add custom encryption algorithms to the bank card number coding rules and magnetic stripe data formats they use.

Code (CVN), the related bank card is also called CVN bank card. 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.