Audio Watermarking Method Based on Phase-shifting Having Robustness Against Band-Pass Filtering Attacks

The focus of digital watermarking for audio signals has been on protecting copyrights and ensuring secret communication. Information hiding or steganography, as it is otherwise known, involves many methods for making communications secret. Of them, the phase-shifting method is robust against MP3 compression attacks, but is weak against others. In this paper, we propose a method for improving its robustness against band-pass filtering attacks. Phase distortion through a band-pass filter (BPF) is estimated and corrected for each frame in an audio signal. As a result, the proposed method improved robustness against band-pass filtering attacks while sufficiently maintaining robustness against MP3 compression attacks.