Research On The Anti-synchronization Attacks Digital Audio Watermarking

Digital watermarking technology is a great potential of digital copyright protection technology and digital audio watermarking is an important research direction of digital watermarking. Digital audio watermarking has been developed rapidly in recent years. For the research of digital audio watermarking people proposed most audio watermarking algorithms in recent years. However we have very few studies to the problem of synchronized attacks of audio watermarking. Synchronized attacks in time domain is the most important and difficult problem in audio watermarking technology. The main work of this paper is researching the problem of anti-synchronized attacks of robust audio watermarking. The contents as follow:(1) We introduce the basic concept and character and application of digital audio watermarking, we statement the auditory masking in time domain and frequency domain of audio in detailed. Then the research and typical algorithms at home and abroad are summarized, at the same time we focused on analysis of synchronization attacks and synchronization strategies of digital audio watermarking.(2) Anti-synchronization attack is a pressing problem. According to the characteristic that dispersed wavelet transform coefficient of digital audio is insensitive to cropping attack and jitter attack .On the other hand, amplitude attack can not change the energy of digital audio signal, we design an invariable watermarking. The scheme has ability to against synchronization attacks such as stretching, jitter and random cutting in time domain.(3) For the problem of digital audio watermarking against synchronization attacks, In this paper proposing a self-synchronization properties of the anti-synchronization attacks audio watermarking algorithm, the algorithm according to maximize the autocorrelation of watermark generated by the same pseudo-random sequence ,Using search mechanism of segments synchronization to obtain Synchronization points of watermark .without additional synchronization signal. So it make watermark more security .The theoretical analysis and experimental results show that the proposed watermarking algorithms have high robustness to some common audio signal manipulation such as synchronization attacks, noise additional, filtering, sampling, quantization and so on.