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Redundant information of low-bit-rate speech is extremely small, thus it'svery difficult to implement large capacity steganography on the low-bit-ratespeech. Based on multiple vector quantization characteristics of the LineSpectrum Pair (LSP) of the speech codec, this paper proposes a steganographyscheme using a 3D-Magic matrix to enlarge capacity and improve quality ofspeech. A cyclically moving algorithm to construct a 3D-Magic matrix forsteganography is proposed in this paper, as well as an embedding and anextracting algorithm of steganography based on the 3D-Magic matrix inlow-bit-rate speech codec. Theoretical analysis is provided to demonstrate thatthe concealment and the hidden capacity are greatly improved with the proposedscheme. Experimental results show the hidden capacity is raised to 200bps inITU-T G.723.1 codec. Moreover, the quality of steganography speech inPerceptual Evaluation of Speech Quality (PESQ) reduces no more than 4%,indicating a little impact on the quality of speech. In addition, the proposedhidden scheme could prevent being detected by some steganalysis toolseffectively.

A novel method of speech information hiding based on 3D-Magic Matrix