A novel dual watermarking algorithm for digital audio

In order to improve the security of dual watermark, a novel dual audio watermarking scheme based on wavelet packet analysis and ultra-chaotic encryption is proposed. First, accuracy parameters are selected to generate super chaotic sequence and ultra-chaotic binary sequence which are used to encrypt zero-watermark sequence and image watermark acquiring more evenly distribution. Then, digital audio is segmented and performed three-level wavelet packet decomposition to obtain node coefficients, where zero-watermark and encrypted watermarking image are embedded. Finally, simulation platform is utilized to test the performance of the algorithm. Results demonstrate that the robustness of zero-watermark is improved resisting to most conventional attack robustness and the effectiveness of semi-fragile watermark in terms of transparency, security, robustness and tampering localization ability.