PESQ-based selection of efficient partial encryption set for compressed speech

Hae Yong Yang, Kyung Hoon Lee, Sang Han Lee, Sung Jea Ko

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)408-418
Number of pages11
JournalETRI Journal
Issue number4
Publication statusPublished - 2009 Aug


  • ITU-T G.729 speech codec
  • Multimedia security
  • Partial encryption
  • Reconstruction attack
  • Wi-Fi

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Electrical and Electronic Engineering


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