A Hybrid High-Capacity Steganography Method in Spatial Domain

Abstract

In this article, we propose a hybrid high-capacity steganography method in spatial domain. This method capable of embedding secret data in gray-scale image that is undetectable by human eye. This method is a combination of Pixel-Value Differencing (PVD) steganography method and Modulus function steganography method. The hiding capacity of PVD method depends on the difference value of the two consecutive pixels. It can adjust the volume of embedding data by the characteristics of image block. The advantage of Modulus function steganography method is simply, easy to implement and can maintain high quality of stego-image. In our scheme, we propose a method to resolve the compatibility issues of the above two steganography methods. The experimental results have also demonstrated that the proposed method can increase the embedding capacity and maintain the same level of stego-image quality with PVD steganography method. In security issues, experiments prove that this method can be successfully withstand RS-diagram attacks.