Steganography Integration Into a Low-Bit Rate Speech Codec
Steganography Integration Into a Low-Bit Rate Speech Codec
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DOI：
10.1109/tifs.2012.2218599
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发表时间：
2012-12
影响因子：
6.8
通讯作者：
Yongfeng Huang;Chenghao Liu;Shanyu Tang;Sen Bai
中科院分区：
文献类型：
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作者：
Yongfeng Huang;Chenghao Liu;Shanyu Tang;Sen Bai
低比特率语音编解码器已广泛应用于VoIP和移动通信等音频通信中，因此低比特率音频流的隐写技术将在实践中具有广泛的应用前景。本文提出了一种将信息隐藏集成到语音编码过程中的低比特率VoIP音频流的隐写算法。该算法在进行低比特率语音编码时进行数据嵌入，同时进行基音周期预测，从而保持了信息隐藏与语音编码的同步。该隐写算法可以实现高质量的语音，防止隐写分析的检测，并且与标准的低比特率语音编解码器具有良好的兼容性，不会因数据嵌入和提取而造成进一步的延迟。测试表明，采用该算法，密文的数据嵌入率可达到4比特/帧（133.3比特/秒）。
Low bit-rate speech codecs have been widely used in audio communications like VoIP and mobile communications, so that steganography in low bit-rate audio streams would have broad applications in practice. In this paper, the authors propose a new algorithm for steganography in low bit-rate VoIP audio streams by integrating information hiding into the process of speech encoding. The proposed algorithm performs data embedding while pitch period prediction is conducted during low bit-rate speech encoding, thus maintaining synchronization between information hiding and speech encoding. The steganography algorithm can achieve high quality of speech and prevent detection of steganalysis, but also has great compatibility with a standard low bit-rate speech codec without causing further delay by data embedding and extraction. Testing shows, with the proposed algorithm, the data embedding rate of the secret message can attain 4 bits/frame (133.3 bits/second).