Secure and intelligent POS (point-of-sale) machine and secure transaction method

The invention relates to a secure and intelligent POS (point-of-sale) machine. The secure and intelligent POS (point-of-sale) machine includes a CPU as well as a magnetic head, a camera, an input button, a display screen, a printer driving module and a public memory which are all connected with the CPU. The secure and intelligent POS (point-of-sale) machine is characterized in that the CPU is connected with a security chip; and the security chip is composed of an encryption and decryption module as well as an interface module and a secure storage module which are connected with the encryption and decryption module, wherein the secure storage module is used for storing identity information and public and private key data, and the encryption and decryption module is used for encryption and decryption for public and private keys. According to the secure and intelligent POS (point-of-sale) machine and the secure transaction method of the invention, since the security chip connected with the CPU is adopted, the se