Multi image encryption and steganography based on synchronization of chaotic lasers

The paper proposes a scheme for achieving steganography with multiple encrypted monochromatic images with keys obtained from a synchronized system of semiconductor lasers. The key selection scheme for steganography determines the robustness of the application. It is in this area that steganography may benefit from the properties of chaos synchronization. The encryption principle of the new algorithm is analyzed quantitatively by various statistical tests. The cover image used in the technique is also obtained from the visual representation of the chaotic sequences. This new scheme enjoys the benefit of added security, high key space, high embedding capacity, imperceptibility and robustness of the hidden information in conjunction with Least Significant Bit (LSB) based substitution. The result is important from the perspective of introducing a mechanism to multiplex and simultaneously transmit multiple images.