1. "The last three digits on the back of a credit card are the credit card verification codes, which are called" the last three digits "in English and abbreviated as CVC (Card Verification Code). It is an additional code printed on the back of a credit card, also called the credit card verification value, abbreviated as CVV(Card Verification Value). The verification code is displayed on the back of the credit card, and the top at the end of the signature is displayed in italics. There are 7 digits at the end of the signature column on the back of the credit card, the first four digits are the last four digits of the card number, and the last three digits are the verification code, that is, the last three digits. Please note that the verification code does not refer to the password of the credit card. The "last three codes" on the back of a credit card is an important element of online transactions. After obtaining the card number, expiration date and "last three codes" of the credit card, I can swipe my card online for consumption, which is my own transaction. Since the password of any issuing bank is only applicable in China, you don't need a password to swipe your card on foreign websites. It is for this reason that the so-called "shocking loophole" in credit card payment has been created. This kind of "loophole" in payment is most prominent when booking air tickets online. Ctrip. Com and E Long. Com only needs to provide the card number, the validity period of the credit card, the "last three" verification code and the cardholder's ID number for customers to purchase air tickets with the credit card. For credit cards issued by some banks, Ctrip. Com doesn't even tell the "last three" verification codes of credit cards, but it can also buy air tickets. "

2. It is suggested that credit card holders improve their awareness of safe card use.