A bulk amorphous metal inductive device comprises a magnetic core having plurality of low-loss bulk ferromagnetic amorphous metal magnetic components assembled in juxtaposed relationship to form at least one magnetic circuit and secured in position, e. The device comprises an optical pulse nonlinear phase shift module, a linear pulse broadening module a linear pulse broadening module, and a module for the linear compensation of the broadening undergone by the pulses in the linear broadening module. Subsequently the system will define uniform rosette cells within the color uniform rosette digital halftone image. Based on the decrypted information, the CPU determines whether the user of the sending side is authentic or not.