Chaotic Watermarking Scheme for Colored Images

The ease with which digital multimedia documents can be manipulated has always raised concerns about the possibility to reliably trust their content. Simple tools are available in everyone's PC that allows digital image modification, without leaving any detectable trace. Digital documents authentication is, thus, one of the most important and investigated security applications. Though cryptography tools are available, they basically authenticate binary streams and not their meaning. Thus, the interest for multimedia content authentication has increased recently. In particular, watermarking-based authentication schemes seem to be offering some advantages over classical cryptography tools. In this paper, a simple image-oriented chaotic algorithm, resilient to compression and filtering, has been proposed. It hides a highly compressed image-watermark inside the Discrete Cosine Transformation (DCT) domain of the image to be authenticated