Robust audio watermarking scheme based on nonuniform discrete fourier transform

To enhance security and robustness of digital audio watermarking algorithms, this paper proposes a robust audio watermarking scheme based on nonuniform discrete Fourier transform (NDFT), where the embedding watermark frequency points are selected by secret key. The proposed method has good security because NDFT transform can set up sampling points with any interval in frequency domain as the requested. Simulation results show that the proposed scheme not only makes sure robustness against common attacks, but it also further improves systemic security and robustness against malicious attack.