Open Access Research Article

An Efficient Objective Intelligibility Measure for Frequency Domain Scramblers

AMCR Borzino1*, JA Apolinário1* and DG da Silva2

Author 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

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EURASIP Journal on Information Security 2007, 2007:032028 doi:10.1155/2007/32028


The electronic version of this article is the complete one and can be found online at: http://jis.eurasipjournals.com/content/2007/1/032028


Received:17 August 2007
Accepted:3 December 2007
Published:24 January 2008

© 2007 Borzino et al.

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.

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.

References

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  2. S Sridharan, E Dawson, B Goldburg, Fast Fourier transform based speech encryption system. IEE Proceedings I 138(3), 215–223 (1991)

  3. HJ Beker, FC Piper, Secure Speech Communications (Academic Press, Boston, Mass, USA, 1985)

  4. D Klatt, 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