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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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PESQ-Based Selection of Efficient Partial Encryption Set for Compressed Speech

  • Yang, Hae-Yong (Network & Communication Security Division, the Attached Institute of ETRI) ;
  • Lee, Kyung-Hoon (Network & Communication Security Division, the Attached Institute of ETRI) ;
  • Lee, Sang-Han (Network & Communication Security Division, the Attached Institute of ETRI) ;
  • Ko, Sung-Jea (Department of Electronic Engineering, Korea University, Seoul, Rep. of Korea.)
  • Received : 2008.09.08
  • Accepted : 2009.04.30
  • Published : 2009.08.30
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Abstract

Adopting an encryption function in voice over Wi-Fi service incurs problems such as additional power consumption and degradation of communication quality. To overcome these problems, a partial encryption (PE) algorithm for compressed speech was recently introduced. However, from the security point of view, the partial encryption sets (PESs) of the conventional PE algorithm still have much room for improvement. This paper proposes a new selection method for finding a smaller PES while maintaining the security level of encrypted speech. The proposed PES selection method employs the perceptual evaluation of the speech quality (PESQ) algorithm to objectively measure the distortion of speech. The proposed method is applied to the ITU-T G.729 speech codec, and content protection capability is verified by a range of tests and a reconstruction attack. The experimental results show that encrypting only 20% of the compressed bitstream is sufficient to effectively hide the entire content of speech.

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References

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