copyright protection for digital images with secured and robust Watermarking in the frequency domain using the YCoCg color space and native encryption method.

Watermarking is a novel approach to prevent unauthorized use of a digital media. By embedding the copyright information in the media, this solution will help protect its property rights. In this paper, a secure and robust method in color space of YCoCg-R is presented to prove the ownership of the media (copyright). The three-dimensional components of this color space are not well correlated, which can be effective in increasing the robustness. The proposed method uses a discrete cosine transform(DCT) and the relationship between its coefficients for embedding.When inserting bits of the cue, the complexity of the initial image blocks is used to select the target blocks and its average coefficients to select the adaptive insertion power, which also creates high resistance(robust), especially against JPEG compression. It also provides an optimal recursive linear transformation with a high branching for parsing and signal coding, and the component Y of color space, and a native linear feedback shift register (LFSR) for producing a suitable key sequence for Increasing the security of the proposed method, taking into account the contrast between the main labeling requirements, including the transparency, resilience, security and capacity of the proposed method, provide better results than other methods. To test the proposed design, standard RGB images (USP-SIPI images) with 512x512 pixels are used as cover images (hosts) using MATLAB2016 software and on a PC with Pentium-IV 3.2 GH processor and RAM 8G memory is implemented. The results show that the proposed algorithm has excellent transparency and resistance.