Journal of Information Security Research Dhekra ESSAIDANI, Hassene SEDDIK, Ezzedine BEN BRAIEK 4 4 2013 http://www.dline.info/jisr/fulltext/v4n4/v4n4a2.pdf The rapid evolution of technology and its applications have created the need for new techniques for copyright protection and data owner identification. Many researches are proposed to establish a potential solution to protect the ownership rights. In the last years, various watermarking techniques have been proposed to protect digital data online. This work presents a watermarking approach based on Radon Transform applied to RGB color image. The simulation results show that the proposed method presents a higher robustness against asynchronous attacks. Also, the comparative study with other recent techniques proved the efficiency of the proposed approach.