An Digital Watermarking Algorithm based on double encryption

In order to guarantee the copyright of two or more people and protect it from single leak, this paper introduces the Arnold scrambling and the sample scrambling for watermark double encryption. The invisibility and robustness are observed and compared with single scrambling. The experimental results proved that the robustness of the double encryption is better than that of single encryption with a slightly worse invisibility. It can achieve better confidentiality requirements of copyright protection.