the security code of visa card is called CVV2(Card Verification Value 2), which has 3 digits and is printed on the back of the credit card at the last 4 digits of the card number.

the security code of MarsterCard is called CVC2(Card Validation Code 2), which has 3 digits and is printed on the back of the credit card at the last 4 digits of the card number.

the security code of the 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 Validation Number 2), which has 3 digits and is printed on the back of the credit card after the last 4 digits of the card number.

the security code of p>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 at the last 4 digits of the card number.

recently, the CVV2 code on the credit card has been widely circulated in the network. It is very important, so you must not disclose it easily. So what is the security code on the credit card?

CVV password verification means that commercial banks add verification code (CVN) of self-defined encryption algorithm to the bank card number coding rules and magnetic stripe data formats used by them, and the related bank cards are also called CVN bank cards.

CVV information is stored in the tracks of magnetic stripe bank cards. According to the information such as card number, track master account number and logo code of the issuing bank, it is encrypted by a special encryption algorithm defined by each bank, and every step is encrypted by CVKA technology to obtain the 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.

so what is the importance of this code? Relevant experts said that CCV2 is usually used to prove that the payer holds the credit card at the time of transaction. At present, online payment generally requires the cardholder to provide the card number, expiration date, CCV2 code and password. However, there are also some websites, especially overseas websites, which do not need passwords, and transactions can be completed by satisfying other items. Therefore, the CVV2 code on the credit card is commonly known as the security code. It is recommended that you do not disclose it easily.

in addition, in order to better prevent the disclosure of the security code, people in the industry suggest that cardholders can cut a small piece of tape and stick the CVV2 code to prevent it from being leaked. At the same time, you should also protect your credit card in an all-round way-try to ensure that the card does not leave your body, do not let the credit card leave your sight when spending, and do not give the card to the clerk to check out, so as to avoid the card information being viewed by outsiders.