Previously, a number of media reported the security problem of copying credit card function, which worried many users. In fact, most of these copied cards are non-CPU cards, which are low-cost and easy to copy. But now, intelligent door lock enterprises have developed a copy-proof CPU card through several years of technical research and development and a lot of investment, and it has been adopted by some pioneer enterprises. For example, the Luke smart lock Classic 2S supports NFC card unlocking, and the card uses double authentication of CA certificate and card private key signature, which can effectively prevent technical attacks and is not easy to be copied. Moreover, even if the NFC card is lost, it is not afraid. Users of Luke Smart Lock can manage the card usage rights at any time through the mobile APP. Once the card is found lost, its authority can be deleted in time, and the card has no unlocking function, so users can use it with peace of mind.