Hybrid Steganography of Color Images Using Discrete Cosine Transform and Discrete Wavelet Transform

Abstract

"> This paper introduces a hybrid approach for steganography of color images using Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). This approach is used for hiding more than one color image into an uncorrelated colorspace "YDbDr" of a color cover image using the DWT and DCT. In this approach, the DCT coefficients of the secret image are weighted by a small factor and then embedded into the DWT of the cover image to keep the effect of steganography invisible, to make it more security by encrypting the secret data before embedding into a cover image. After that, we show the effect of additive white Gaussian noise (AWGN) on the proposed algorithm.