A system and method for securing input signals when using input interfaces such as touch-screens and other input interfaces that are suitable for handheld, mobile, computing and other devices, by generating fake signals. The method includes replacement of at least a part of said multivalent cations andor said multivalent inorganic anions and organic acid anions respectively by monovalent metal cations andor monovalent anions to produce a solution. The laser is controlled in a raster scan fashion across the selected locations of the powder layer. A second, pulse width modulated controlled, switch 18 is operatively associated with the motor.