Blind Watermarking Technique Using Chaotic Variations of AES for Color Images in Wavelets

Modern digital communication requires watermarking technique for copyright and user’s authentication purpose. In this paper, a blind digital watermarking technique has been proposed using Discrete Wavelet Transform (DWT) to embed information in midfrequency. Three chaotic variations of standard AES algorithm are used to shuffle the original pixel positions of watermark color image. The original cover image is decomposed into its respective RGB components. The resulting watermark images are embedded into separate components of cover images using DCT. The intensity values of watermark images are embedded in mid frequency of DWT coefficients of cover images. The experimental results show that the algorithm is effective and robust enough to sustain the noise attacks such as Gaussian noise.