Security method of keyboard input by directly controling the keyboard controler

A keyboard input security method by direct control of a keyboard controller is provided to independently secure information inputted through a keyboard without respect to interconnection with an OS(Operating System) type, thereby processing keyboard input information before an irruption system. An input information processing module checks status information of a keyboard controller(S11). An interrupt generation request function of the keyboard controller is stopped(S12). The input information processing module checks whether the keyboard input information recorded in an keyboard I/O port is a security target(S14). If it the security target is checked, the keyboard input information recorded in the keyboard I/O port is encrypted(S16). The encrypted input information is transferred to a keyboard security module(S17). The keyboard input information remaining in the keyboard controller is deleted(S18).