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Paper Abstract and Keywords
Presentation 2014-03-07 15:00
[Poster Presentation] Study on scramble method for speech signal by using random bit shift of quantization
Zhi Zhu, Katsuhiko Yamamoto, Masashi Unoki (JAIST), Naofumi Aoki (Hokkaido Univ.) EMM2013-109
Abstract (in Japanese) (See Japanese page) 
(in English) Speech scrambling aims to eliminate the intelligibility of original speech in order to preventing eavesdropping and copyright infringement. There is, however, a problem in that completely recovering scrambled speech into the original speech cannot be achieved with conventional methods. In this paper, we propose a speech scrambling method that uses the random-bit-shift of quantization bits with common keys. We evaluated the confidentiality and efficiency of the proposed method by using two objective measures, SER and PESQ. As a result we confirmed that speech signals could be scrambled into completely unintelligible sounds with the proposed method. Moreover, it is possible to restore a scrambled speech signal into the original one completely. In addition, we also confirmed that the scrambled speech signal could not be descrambled correctly with the wrong key. Finally, in order to increase the confidentiality, we investigated possibility of improved method, that randomizes the order of samples in addition to the proposed method.
Keyword (in Japanese) (See Japanese page) 
(in English) Speech Scramble / Random Bit Shift / PCM Speech Signal / Secure Voice / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 480, EMM2013-109, pp. 57-62, March 2014.
Paper # EMM2013-109 
Date of Issue 2014-02-28 (EMM) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMM  
Conference Date 2014-03-07 - 2014-03-08 
Place (in Japanese) (See Japanese page) 
Place (in English) JAIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Poster Session, etc. 
Paper Information
Registration To EMM 
Conference Code 2014-03-EMM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on scramble method for speech signal by using random bit shift of quantization 
Sub Title (in English)  
Keyword(1) Speech Scramble  
Keyword(2) Random Bit Shift  
Keyword(3) PCM Speech Signal  
Keyword(4) Secure Voice  
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1st Author's Name Zhi Zhu  
1st Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
2nd Author's Name Katsuhiko Yamamoto  
2nd Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
3rd Author's Name Masashi Unoki  
3rd Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
4th Author's Name Naofumi Aoki  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
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Speaker Author-1 
Date Time 2014-03-07 15:00:00 
Presentation Time 120 minutes 
Registration for EMM 
Paper # EMM2013-109 
Volume (vol) vol.113 
Number (no) no.480 
Page pp.57-62 
#Pages
Date of Issue 2014-02-28 (EMM) 


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