The holder inquires the security code himself and looks at it in kind. That is, there are seven (or eight) bold characters on the back of the credit card, the first four digits are the bank mantissa, and the three or four digits behind the space are the security code.

The generation method of 1. is that the bank extracts the card account number, validity period and service code, 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.

2. This is the security code of the credit card when conducting online or telephone transactions. It is usually used to prove that the payer has a credit card at the time of transaction, thus preventing credit card fraud.

3. The credit card used for a long time is not properly kept, which leads to ambiguous numbers. You can cover it with a thin piece of white paper and smear it slowly in the corresponding position, which is generally visible. Write down the security code in a private book or write it by hand. When you forget the security code or the security code is not clearly displayed, take it out and check it. If you really can't view it, you can also apply for a new card from the bank, that is, cancel the original card and replace it with a new one. The security code after card replacement is the same as that of the previous card.

The security code of 1.VISA card is called CVV2, which has three digits and is printed on the last four digits of the signature column on the back of the credit card.

2. MasterCard's security code is called CVC2, which has three digits and is printed in the last four digits of the signature column on the back of the credit card.

3. The security code of the 3.discovery card is called CardmemberID, which has three numbers and is printed on the signature column on the back of the credit card.

4. The security code of American Express Card is called CID, which has four numbers and is printed on the front of the credit card.

5. The security code of UnionPay card is called CVN2, with 3 digits printed on the back of the credit card.

6. The security code of 6.JCB card is called CAV2(CardAuthenticationValue2), which has 3 digits and is printed on the last 4 digits of the signature column on the back of the credit card.

What does the security code of the credit card mean?

CVV2 code is a verification code, also known as security code, which is used for checking when credit cards are not swiped directly (such as online payment). Generally, it is the last three digits of the seven-digit signature column on the back of your bank card. For example: 1234567, just enter 567.

The verification code will change every time you change your bank card. If it is blurred, you can cover it here with white paper and draw it repeatedly to show these three numbers.

If the input error is locked for many times, it will be recovered the next day. This verification code can only be viewed through your own card.

skill

CVV2 code belongs to the important information of personal account. For the sake of account security, it is recommended not to disclose it to others at will.

What is the security code of China Bank UnionPay credit card?

The first four digits of the seven digits on the back of the card are the mantissa of your credit card, and the last three digits are mainly used for telephone transactions. You can provide information such as expiration date and password on the back of the card to complete the payment.

The above contents are for your reference. Please refer to the actual business regulations.

What is the security code of the credit card?

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.

What is a credit card?

Creditcard (English: credit card), also known as credit card. It is a non-cash transaction payment method and a simple credit service.

Credit card is generally a special carrier plastic card with consumer credit, which is 85.60mm long, 53.98mm wide and 1mm thick. It is issued by banks to individuals and units, so that they can shop, spend and deposit and withdraw cash from banks. The form is a card with the name, expiration date, number and cardholder's name printed on the front, and a magnetic stripe and signature on the back.

Credit cards are issued to cardholders by banks or credit card companies according to the credit and financial resources of users. Cardholders don't need to pay cash when using credit cards, they will make repayment on the bill date.

2065438+On April 5, 2006, the central bank issued the Notice of the People's Bank of China on matters related to credit card business, canceling the late payment fee for credit cards, introducing liquidated damages, and prohibiting the collection of over-limit fees. The new regulations came into effect on April 20, 2007.

Debit card is an ordinary savings card, and its account attribute is current deposit account, which can be used for consumption, atm deposit and withdrawal, etc. Credit cards can be used for spending, atm deposits and withdrawals, etc. The biggest advantage is that you can overdraw (with a certain credit limit).

Generally speaking, bank cards are divided into credit cards and debit cards.

Credit cards are divided into credit cards and quasi-credit cards. Credit card refers to the credit card that the issuing bank gives the cardholder a certain credit limit, and the cardholder can spend first and then repay. Quasi-credit card refers to a credit card in which the cardholder deposits a certain amount of reserve fund according to the requirements of the bank, and when the reserve fund is insufficient to pay, it can be overdrawn within the credit limit stipulated by the issuing bank.

Debit cards are divided into transfer cards, special cards and stored value cards according to different functions. Debit cards cannot be overdrawn. The transfer card has the functions of transfer, cash deposit and withdrawal and consumption. Special card is a special-purpose debit card used in a specific area (except for department stores, restaurants and entertainment industries). It has the functions of transferring money and depositing and withdrawing cash. Stored value card is a prepaid wallet debit card in which the bank transfers funds to the card for storage according to the cardholder's requirements, and directly deducts money from the card during the transaction.

Credit card security code

Basic definition

CVV2 code, also known as credit card security code, is a security code for credit card transactions. Usually printed on the back of the credit card after the signature, that is, the last 3 digits in italics.

Usage analysis

The three-digit CVV2 code behind the credit card is the security code of the credit card when conducting online or telephone transactions, which is usually used to confirm that the payer really holds the credit card when conducting transactions.

Because some websites, especially overseas websites, do not need a password when paying by credit card online, they only need to pass, expire and CVV2 code to complete the transaction, so the importance of CVV2 code is almost equal to the password.

Protection method

1, the cardholder can cut a small piece of tape and affix CVV2 code to prevent leakage;

2. Try to keep the card with you, don't let the credit card leave your sight when spending, and don't give the card to the clerk to check out, so as to avoid the information on the card being viewed by outsiders.

What is a credit card security code?

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.

Credit card security code is also called CVV code. According to bank security experts, the three-digit CVV code behind the credit card is the security code of the credit card when conducting online or telephone transactions. It is usually used to confirm that the payer does hold a credit card at the time of transaction.

The security code is equivalent to the ID card of a credit card and is unique. Even if the credit card expires, it will not change, but the security code will change. Credit card, expiration date and security code constitute the specific consumption agreement code of credit card, and cardholders can use this information for online consumption, so the security code is as important as the consumption password, so don't disclose it to outsiders at will.

In real life, it often happens that the credit card security code is leaked, which leads to the theft of the credit card. Therefore, protecting the security code of credit card from being leaked is a security awareness that cardholders must have when using their cards every day.

What is the security code of the credit card? Let's stop here.