Title :
On the use of a frequency domain vector codebook for the cryptanalysis of analog speech scramblers
Author :
Goldburg, B. ; Sridharan, S. ; Dawson, E.
Author_Institution :
Queensland Univ. of Technol., Brisbane, Qld, Australia
Abstract :
The authors present a novel application for a frequency domain codebook, similar to that used in the vector quantization of speech. It is shown that such a codebook can be used to cryptanalyze commonly used analog speech scramblers such as the bandsplitter and DFT (discrete Fourier transform) based encryption systems. In each case intelligible speech can be recovered using about three seconds of encrypted speech
Keywords :
cryptography; speech analysis and processing; 3 s; DFT encryption scheme; analog speech scramblers; bandsplitter; cryptanalysis; discrete Fourier transform; encrypted speech; encryption systems; frequency domain codebook; frequency domain scramblers; frequency domain vector codebook; intelligible speech; Cryptography; Cutoff frequency; Discrete transforms; Filter bank; Frequency domain analysis; Information security; Multidimensional signal processing; Multidimensional systems; Speech processing; Vector quantization;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176340
