Image Steganography Based on Least Significant Bit (LSB) and 4-Dimensional Lu and Liu Chaotic System

One of the tasks in steganography is extend area in the cover media for embedding more secret messages with enhancing security key and then extract messages with minimum error. In this direction, this paper propose hiding gray images inside a color image based on steganography Least Significant Bits method (LSB) with shuffling by using two types of 4-D chaotic system (Lu and Liu). The color image (RGB model) separated into three cover images (red, green, and blue) and each one of these three cover images may be used to hide 3-shuffled secret images. 4-D chaotic system provide an efficient security key and more difficult to forecast attack. Peak signal to noise ratio (PSNR) and mean square error (MSE) proves that both of secret and cover images are retains its explicitness and characteristics after reconstruction in the receiver.