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AN OPTIMAL information hiding ALGORITHM FOR speech IN THE FRACTIONAL FOURIER TRANSFORM DOMAIN

Journal of Electronics(China) 2010年第4期27卷 564-570页

作者： Xi Ji Zou Cairong Bao Yongqiang Wang Qingyun School of information Science and Engineering Southeast University Nanjing 210096 China College of Computer and information Hohai University Changzhou 213022 China School of Communication Engineering Nanjing Institute of Technology Nanjing 21116 China

With the increasing requirement of military and security, the technology of information hiding for speech becomes a hotspot and difficulty in the fields of speech signal processing and in-formation security, which is developing rapidly. In order to stand against the stegano-analysis, the paper proposed an optimal information hiding algorithm for speech in the Fractional Fourier Transform (FrFT) domain based on the Minimum Mean Square Error (MMSE) criterion. The results of simulation and experiments show that speech modified by the proposed algorithm has no remarkable changes both in time and frequency domains, which can effectively resist the time and frequency analysis, Otherwise, the algorithm is robust to general signal process attack, and the difference is imperceptible between the original and modified speech.

关键词： Practional Fourier Transform (FrFT) speech information hiding Minimum Mean Square Error (MMSE)

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An Approach of Steganography in G.729 Bitstream Based on Matrix Coding and Interleaving

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Chinese Journal of Electronics 2015年第1期24卷 157-165页

作者： WU Zhijun CAO Haijuan LI Douzhe Tianjin Key Laboratoruy for Advanced Signal Processing Civil Aviation University of China (CAUC)

This paper proposes an approach of secure communication through the Internet based on the technology of speech information hiding. In this approach,the algorithm of embedding a 2.4Kbps low-bit-rate Mixexcitation linear prediction(MELP) speech into G.729 coding speech is presented by adapting the techniques of covering code and the interleaving. The parameters in G.729 source codec are analyzed in the Capability of noise tolerance(CNT) and selected to carry secret speech data because these parameters have less impact on the quality of being reconstructed speech. Experiment results show that the proposed steganography algorithm not only gained a high data embedding rate up to 2.4Kbps but also achieved better imperceptibility, which indicates that the algorithm can be used for high data embedding capacity hiding and can achieve good effect.

关键词： speech information hiding MELP G.729 Matrix coding Interleaving.

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