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The ISC International Journal of Information Security
Journal Archive
Volume Volume 9 (2017)
Volume Volume 8 (2016)
Volume Volume 7 (2015)
Volume Volume 6 (2014)
Volume Volume 5 (2013)
Volume Volume 4 (2012)
Volume Volume 3 (2011)
Volume Volume 2 (2010)
Volume Volume 1 (2009)

 

Facts & Figures

Publication starting date

 2009

h-index

 11

i10-index

 14

Citations

 337

Issue per year

 2

No. of volumes

 9

No. of issues

 17

No. of articles

 92

No. of review papers

 7

No. of research papers

 85

No. of pages

 1485

No. of references

 2995

No. of contributors

 255

No. of databases

 22

 

 
Ghasemzadeh, H., Tajik Khasss, M., Mehrara, H. (2017). Cipher text only attack on speech time scrambling systems using correction of audio spectrogram. The ISC International Journal of Information Security, 9(2), 33-47.
H. Ghasemzadeh; M. Tajik Khasss; H. Mehrara. "Cipher text only attack on speech time scrambling systems using correction of audio spectrogram". The ISC International Journal of Information Security, 9, 2, 2017, 33-47.
Ghasemzadeh, H., Tajik Khasss, M., Mehrara, H. (2017). 'Cipher text only attack on speech time scrambling systems using correction of audio spectrogram', The ISC International Journal of Information Security, 9(2), pp. 33-47.
Ghasemzadeh, H., Tajik Khasss, M., Mehrara, H. Cipher text only attack on speech time scrambling systems using correction of audio spectrogram. The ISC International Journal of Information Security, 2017; 9(2): 33-47.

Cipher text only attack on speech time scrambling systems using correction of audio spectrogram

Article 5, Volume 9, Issue 2, Summer and Autumn 2017, Page 33-47  XML PDF (3137 K)
Document Type: ORIGINAL RESEARCH PAPER
Authors
H. Ghasemzadeh* ; M. Tajik Khasss; H. Mehrara
Abstract
Recently permutation multimedia ciphers were broken in a chosen-plaintext scenario. That attack models a very resourceful adversary which may not always be the case. To show insecurity of these ciphers, we present a cipher-text only attack on speech permutation ciphers. We show inherent redundancies of speech can pave the path for a successful cipher-text only attack. To that end, regularities of speech are extracted in time and frequency using short time Fourier transform. We show that spectrograms of cipher-texts are in fact scrambled puzzles. Then, different techniques including estimation, image processing, and graph theory are fused together in order to create and solve these puzzles. Conducted tests show that the proposed method achieves accuracy of 87.8% and intelligibility of 92.9%. These scores are 50.9% and 34.6%, respectively, higher than scores of previous method. Finally a novel method, based on moving spectrogram distance, is proposed that can give accurate estimation of segment length of the scrambler system.
Keywords
Cryptanalysis; Cipher text only attack; Audio scrambling system; Multimedia encryption systems; Jigsaw puzzle; Spectrogram
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