A Secure Image Steganography Based on DCT Domain

Information hiding is an information security technology of secretly embedding information into digital multimedia such as image, video and audio signals without changing the perceptual quality of the cover-data. In this paper, we propose a high embedding capacity steganographic method in still image based on transform domain. With this method we embed the information in the transform domain after decorrelating the image in the spatial domain. The decorrelation processing results in a significant increase in the number of transform coefficients that can be used to embed the secret information into. Experimental results show that the proposed method can not only preserve good stego-image quality, but also have a good performance in resisting to chi-square analysis method, information quantity estimation method, RS analysis method and Jeremiah’s histogram analysis method.