Cvv of China Construction Bank is a credit card security check code, which is a 3-digit or 4-digit number generated by card number, expiration date and service constraint code, and is a set of numbers engraved on the signature column on the back of the credit card. This set of figures can't be obtained from the industry system even by staff, only users know it.

Remedial measures for credit card security code leakage?

① The cardholder should report the loss at the first time to prevent others from stealing the brush and causing losses.

2. The cardholder should apply for a new card at the bank outlet as soon as possible. After the new card is issued, the security code is different from before.