vv2 is the security code of a credit card. It is usually printed on the back of the credit card. It is the three italic digits after the signature line. It is usually used by cardholders for online shopping and telephone transactions. If the card is leaked, it can easily be used. Stealing. It is recommended that after applying for a credit card, you use tape to cover the security code so that it cannot be easily observed by others, and the cardholder cannot forget it, because if the security code is lost, it cannot be retrieved.
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 owns the credit card at the time of the transaction.
Main purpose
The credit card security code is equivalent to the credit card’s ID card. We can use this code to conduct consumer transactions. Shopping on overseas websites does not require a password. As long as the buyer provides an account number and security code, the transaction can be completed. In China, there are also merchants that have signed contracts with banks to complete phone transfers without a credit card password and only with a security code. Therefore, everyone must take good care of their credit cards and keep them out of their sight when making purchases to avoid others 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.
CVV codes are verified during online transactions (card swiping), while credit card security codes are verified more often during off-site transactions or card-not-present transactions.
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 uses CVKA technology encrypts and gets 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 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 after the 4 digits of the card number.
The security code of MasterCard is called CVC2 (Card Validation Code 2). It has 3 digits and is printed flat on the signature line on the back of the credit card after the 4 digits of the card number.
The security code of the Discover Card is called Cardmember ID, which is a 3-digit number and is printed flat on the signature line on the back of the credit card.
The security code of American Express is called CID (Card Identification Number), which is a 4-digit number and is printed flat on the front of the credit card above the credit card number.
The security code of China UnionPay is called CVN2 (Card Validation Number 2). It has 3 digits and is printed flat on the signature line on the back of the credit card after the last 4 digits of the card number.
The security code of JCB card (Japan Credit Bureau) is called CAV2 (Card Authentication Value 2). It has 3 digits and is printed flat on the signature line on the back of the credit card after the 4 digits of the card number.