Abstract: A password input method that includes calling a user space in an internal memory to obtain a password input request and to send the password input request to a security chip connected with the internal memory; calling the user space to receive random keyboard data generated by the security chip according to the password input request, and displaying a randomly arranged keyboard according to the random keyboard data; and calling a kernel space in the internal memory to obtain password coordinate data input through the keyboard and to send the password coordinate data to the security chip, so that the security chip generates a password plaintext of user input according to the password coordinate data and the random keyboard data.

Abstract: The present application is applicable to the technical field of terminals and provides a method and device for ensuring security of a firmware of a POS machine. The method includes: according to a CPU type, presetting a loading mode corresponding to the CPU type; and selecting, according to the loading mode, an embedded multi media card (eMMC) boot medium to load first-level boot firmware. Through the method, the loading from another boot medium that can be connected externally can be avoided, and the replacement or tampering of firmware in a POS machine through the boot medium is prevented, to ensure that the POS machine meets the security requirement.