Covert voice over internet protocol communications based on spatial model

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• 作者：YongFeng Huang ; ShanYu Tang
• 关键词：covert communication ; multimedia networking ; VoIP ; data security
• 刊名：SCIENCE CHINA Technological Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：59
• 期：1
• 页码：117-127
• 全文大小：635 KB
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• 作者单位：YongFeng Huang (1) (2)
  ShanYu Tang (3) (4)
  
  1. Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
  2. Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, 100084, China
  3. School of Computer Science, China University of Geosciences, Wuhan, 430074, China
  4. Department of Computing, London Metropolitan University, London, N7 8DB, UK
  
• 刊物类别：Engineering
• 刊物主题：Chinese Library of Science
  Engineering, general
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1900

文摘

This paper presents a new spatial steganography model for covert communications over voice over internet protocol (VoIP), providing a solution to the issue of increasing the capacity of covert VoIP channels without compromising the imperceptibility of the channels. Drawing from Orthogonal Modulation Theory in communications, the model introduced two concepts, orthogonal data hiding features and data hiding vectors, to covert VoIP communications. By taking into account the variation characteristics of VoIP audio streams in the time domain, a hiding vector negotiation mechanism was suggested to achieve dynamic self-adaptive steganography in media streams. Experimental results on VoIP steganography show that the proposed steganographic method effectively depicted the spatial and temporal characteristics of VoIP audio streams, and enhanced robustness against detection of steganalysis tools, thereby improving the security of covert VoIP communications.