High capacity and robust speech data hiding in colour images

Steganography is a method for hiding information in a host signal. The host signal can be a still image, speech or video and the message signal that is hidden in the host signal can be a text, image or an audio signal. In this method host signal is image and secret message is audio signal. In this paper, a data hiding scheme by Discrete Wavelet Transform with LSB substitution is proposed. By applying Discrete Wavelet Transform on secret message, message data is hidden in the LSB´s of the colour image pixels. The worst case mean-square-error and PSNR between the stego-image and the cover-image is derived. Experimental results show that the stego-image is visually indistinguishable from the original cover-image. In this paper male/female speeches are hiding inside digital images. Discrete Wavelet Transform (DWT) is applied on secret speech signal followed by LSB method to obtain the stego-image at transmitter side. At receiver end Inverse Discrete Wavelet transform applied on stego image and secret signal can retrieve by LSB method.