Embedding and extracting method for audio zero water mark based on vector quantization of coefficient of mixed domain

Abstract

An audio zero watermark embedding and extraction method is based on mixed domain coefficient vector quantization in an audio processing method in the information security technical field. The watermark embedding part of the method is as follows: segmenting processing of an original audio signal is carried out; discrete wavelet transformation of each segment of audio frequency is carried out to extract a wavelet approximate component; discrete cosine transform and vector quantization of the obtained wavelet approximate component are carried out; a polarity vector is constructed according to the statistic characteristics of an index value after vector quantization; and through carrying out XOR operation of the polarity vector and a to-be-embedded original watermark signal, a watermark is embedded in a detection cipher key. The watermark extraction part of the method is as follows: firstly, a polarity vector is obtained from a to-be-measured audio signal through adopting a method identical to that of the watermark embedding part; then, XOR operation of the polarity vector and a watermark detection cipher key is carried out to obtain an extracted watermark signal. The audio zero watermark embedding and extraction method shows stronger robustness to various normal audio signal processing operations and malicious attacks, and also omits the trouble of reconstructing an audio carrier signal.

Description

technical field [0001] The invention relates to an audio processing method in the technical field of information security, in particular to an audio zero-watermark embedding and extraction method based on mixed domain coefficient vector quantization. Background technique [0002] Transparency and robustness in audio watermarking are a pair of contradictions. If this contradiction is not resolved properly, it will affect the application of audio watermark embedding and extraction methods. But imperceptibility and robustness do not affect the feasibility of watermarking at present. However, if there are loopholes in the watermarking method itself, which makes the watermarking system have fatal security problems and gives attackers an opportunity, then the feasibility of the watermarking system will be questioned, and it can be seen that the security problem is very important. Security issues will be addressed through the concept of reversible watermarking introduced below. ...

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Problems solved by technology

[0008] After searching the prior art documents, it was found that Wang X.-Y. et al published "A Novel Synchronization Invariant Audio WatermarkingScheme Based on DWT and DCT" (a novel synchronous audio watermarking system based on DWT and DCT), proposed an audio watermarking method based on DWT and DCT, which is robust against normal audio signal processing and malicious attacks However, the method proposed in this literature cannot fundamentally solve the inherent contradiction between the robustness and imperceptibility of audio watermarking, and the robustness of this method against various malicious attacks remains to be determined. improve

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