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arXiv 1910.04433cs.MM
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低码率语音信号中QIM隐写分析的层次表示网络

Hierarchical Representation Network for Steganalysis of QIM Steganography in Low-Bit-Rate Speech Signals

Hao Yang, Zhongliang Yang, YongJian Bao, Yongfeng Huang

摘要:

近年来,随着IP语音(Voice over IP,VoIP)业务量的不断增长,基于VoIP的隐写方法也越来越多,对网络空间的安全构成了极大的威胁。低速率语音编解码器由于其强大的压缩能力而被广泛应用于VoIP应用中。QIM隐写术使得在VoIP流中隐藏秘密信息成为可能。以往的研究主要集中在提取码字的帧间或帧内相关性特征,而忽略了语音帧的层次结构。本文针对低比特率语音信号中QIM隐写术的复杂多尺度结构,设计了一种层次表示网络来进行隐写分析。该模型采用卷积神经网络(CNN)对语音帧中的层次结构进行建模,并在不同的卷积块上采用三级注意力机制,使其能够区分地关注语音帧中重要性较高和较低的内容。实验表明,该方法的隐写分析性能优于现有的隐写分析方法,尤其是在检测短的和低嵌入的语音样本。此外,我们的模型需要更少的计算,并具有更高的时间效率,可以应用到实际的在线服务。

英文摘要:

With the Volume of Voice over IP (VoIP) traffic rises shapely, more and more VoIP-based steganography methods have emerged in recent years, which poses a great threat to the security of cyberspace. Low bit-rate speech codecs are widely used in the VoIP application due to its powerful compression capability. QIM steganography makes it possible to hide secret information in VoIP streams. Previous research mostly focus on capturing the inter-frame correlation or inner-frame correlation features in code-words but ignore the hierarchical structure which exists in speech frame. In this paper, motivated by the complex multi-scale structure, we design a Hierarchical Representation Network to tackle the steganalysis of QIM steganography in low-bit-rate speech signal. In the proposed model, Convolution Neural Network (CNN) is used to model the hierarchical structure in the speech frame, and three level of attention mechanisms are applied at different convolution block, enabling it to attend differentially to more and less important content in speech frame. Experiments demonstrated that the steganalysis performance of the proposed method can outperforms the state-of-the-art methods especially in detecting both short and low embeded speech samples. Moreover, our model needs less computation and has higher time efficiency to be applied to real online services.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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