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++and expiration date and CVV2 code to complete the transaction, so the importance of CVV2 code is almost equal to 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-or 4-digit number printed on the back of a credit card, and the printing position of different types of cards will be different.

Turn the credit card over. There are several digits on the cardholder's signature, and the last three digits are the 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-or 4-digit number printed on the back of a credit card, and the printing position of different types of cards will be different. Turn the credit card over. There are several digits on the cardholder's signature, and the last three digits are the credit card security code. Credit card security code is usually used to prove that the payer has a credit card at the time of transaction to prevent credit card fraud.

Extended data:

CCB's credit card security code shows 7 digits, of which the first 4 digits are the last 4 digits of credit card++,and the last 3 digits are the security check code of credit card. If you need a credit card security code, just enter the last 3 digits.

The generation method of credit card security code 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.

References:

Baidu encyclopedia-credit card security code

Where can I see the credit card security code?

The holder inquires the security code himself and looks at it in kind. That is, there are 7-digit (8-digit) bold characters on the back of the credit card, the first 4 digits are the mantissa of the bank++,and the 3 or 4 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, resulting in ambiguous numbers. You can cover it with a thin piece of white paper and slowly smear it 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 back of the credit card, in the last four digits of++.

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

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 above the credit card++.

5. The security code of UnionPay card is called CVN2, which has 3 digits and is printed on the back of the credit card after the last 4 digits of++.

6. The security code of 6.JCB card is called CAV2(CardAuthenticationValue2), which has three digits and is printed on the back of the credit card, in the last four digits of++.

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 after the credit card expires and is replaced,++will not change, but the security code will change. The credit card++number, expiration date and security code constitute the specific consumption agreement code of the credit card, and the cardholder 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.

So much for the introduction of credit card security.