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  • Research Article
  • Open Access

An Efficient Objective Intelligibility Measure for Frequency Domain Scramblers

EURASIP Journal on Information Security20082007:032028

https://doi.org/10.1155/2007/32028

  • Received: 17 August 2007
  • Accepted: 3 December 2007
  • Published:

Abstract

An objective performance measure is proposed to evaluate the intelligibility of a speech signal having its frequency subbands permuted. The proposed tool can be used to generate efficient keys for frequency domain scramblers as well as to assess the results of cryptanalysis.

Keywords

  • Frequency Domain
  • Speech Signal
  • Objective Performance
  • Data Security
  • Intelligibility Measure

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Authors’ Affiliations

(1)
Department of Electrical Engineering, Military Institute of Engineering (IME), Praça General Tibúrcio 80, Rio de Janeiro, RJ, 22290-270, Brazil
(2)
Center for Telecommunications Studies (CETUC), Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rua Marquês de São Vicente 225, Rio de Janeiro, RJ, 22453-900, Brazil

References

  1. Jayant NS: On the effective number of keys in a voice, privacy system based on permutation scrambling. AT&T Technical Journal 1987, 66(1):192-196.View ArticleGoogle Scholar
  2. Sridharan S, Dawson E, Goldburg B: Fast Fourier transform based speech encryption system. IEE Proceedings I 1991, 138(3):215-223.Google Scholar
  3. Beker HJ, Piper FC: Secure Speech Communications. Academic Press, Boston, Mass, USA; 1985.Google Scholar
  4. Klatt D: Prediction of perceived phonetic distance from critical-band spectra: a first step. Proceedings of the IEEE International Conference on Acoustics, Speech ,and Signal Processing (ICASSP '82), May 1982, Paris, France 7: 1278-1281.View ArticleGoogle Scholar

Copyright

© A. M. C. R. Borzino et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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