Use a chip card to prevent copying. It is very easy to copy a magnetic stripe card. All the information is stored in the magnetic track. If you buy a bank card reader and writer, you can read the original card data and write it to a blank card very easily. The cost of criminal equipment does not exceed 1,000 yuan, and the technical difficulty is also very low. There is a CPU in the chip card and a simple "operating system" called COS. When reading and writing information, instructions need to be issued and the CPU responds. Each cpu card is different and cannot be copied. This is not the key to security. The key is that the chip card needs to be securely authenticated and at the same time ensure security through certificates. Criminals can find ways to buy equipment, but there is no way to get the bank's private key certificate.