A Robust Image Steganography using CDF Lifting Scheme and Huffman Encoding

Abstract

In the modern era, concerns about safeguarding the information from attacks are on rise. Here, 2-d lifting wavelet decomposition of a grayscale cover image through Cohen, Daubechies and Feauveau (2,2) lifting wavelet is performed and three secret images are shuffled and embedded in detail coefficients of the transform using approximation coefficients as indicator. Here, a novel Approximate Coefficients Value Indicator methodology is used to shuffle and embed the binary images in detail coefficients. Lossy and lossless steganographic techniques, followed by a lossless compression scheme using Huffman encoding are proposed. In lossy steganographic technique, secret images are embedded in LSB values of high frequency bands of the transform. In lossless technique, high frequency band values are expanded and images are embedded as previous method. Attacks such as Histogram attacks, statistical attacks are performed to check the robustness of the proposed algorithm. MSE and PSNR values are calculated to demonstrate the imperceptibility of the proposed method.