2. The security code of 2.MarsterCard is called CVC2 (Card Verification Code 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card. In online transactions, we are often asked to fill in the last three digits of the signature column on the back of the credit card, which are the credit card security codes CVC2 and CVC2 that this article will introduce to you. Among them, the security code of Visa is called CVV 2 (card verification value 2); The security code of MasterCard is called CVC2 (Card Verification Code 2). Card security code is a security feature of credit cards when they conduct telephone transactions or online transactions (cards cannot be swiped). Although the names of CVV2 and CVC2 are different, the generation method is the same. The bank extracts the card account number, validity period and service code, and then calculates it through a series of complicated algorithms. As an ordinary credit card holder, we only need to protect the security codes of CVV2 and CVC2 from being leaked. Some POS machines in China print out POS sheets with card numbers and expiration dates, and cardholders re-sign, which has leaked a lot of information. If the cashier pays more attention to the credit card security code on the back, he can pay for the consumption on foreign websites, which is quite dangerous to think about. Be careful of people's worries. Some card friends suggest scraping off CVV2/CVC2 with a knife after receiving the credit card and memorizing the security code, which will test the cardholder's memory. It's ok to carry it for two or three months, but the validity period of a credit card is generally three years ... it's not easy to remember the CVV2/CVC2 security code of each card if you have more cards. The editor of our credit card online suggests that you stick the security code with a piece of tape. If you can't remember, take off the tape, read it, and then stick it back. Without protection, it's best to put your credit card in a place where you can't see it, for example, don't ask the waiter to swipe it for you when checking out at the hotel.