Chaotic map based steganography of gray scale images in wavelet domain

Abstract

In this study, we proposed a method of hiding the stego image in cover image by using a technique called fractional fourier transform with wavelet coefficients. Application of steganography is internet/web security. To maintain higher security Arnold transform is performed on host image with key, key is only known to a receiver/sender. For embedding, perform a fractional Fourier transform of cover image and secret image. Then apply DWT on both images. Cover image and secret image will added by using a technique called alpha blending which can add foreground with background color and wavelet coefficients of both images. Stego image will be extracted by applying IDWT (Inverse Discrete Wavelet Transform). For extracting, cover image will subtracted from stego image by using alpha blending. Secret image will be produced. By considering different aspects we have investigated the results of our scheme. This proposed method provides higher security, robustness against different attacks, good feasibility.