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Paper Abstract and Keywords
Presentation 2018-11-03 11:00
A Statistical Method for Searching Biases of Stream Ciphers
Seiya Tanamoto, Toshihiro Ohigashi (Tokai Univ), Takanori Isobe (Univ. of Hyogo) ISEC2018-64 SITE2018-42 LOIS2018-24
Abstract (in Japanese) (See Japanese page) 
(in English) Plaintext recovery attacks on stream ciphers based on biases of keystream in the broadcast setting where same plaintext is encrypted by different user keys have been proposed. Their attacks depended on strength of biases of the keystream. In general, these biases are discovered by experimentally search. Since it is judged that bias is discovered from computer experiments by the subjectivity of the researchers,
another bias were often overlooked. In this paper, we give a statistical evaluation method for analyzing the experimental result of bias search of stream ciphers. In addition, we apply our method to RC4 stream cipher. As the results, our method found all known strongest signle-byte bias for from the 1st to 259th bytes of the keystream.
Furthermore, our method shows that from the 260th to 5000th bytes of keystream do not have large bias compared with
the first 259 bytes of that.
Keyword (in Japanese) (See Japanese page) 
(in English) stream Cipher / biases / keystream / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 279, ISEC2018-64, pp. 1-6, Nov. 2018.
Paper # ISEC2018-64 
Date of Issue 2018-10-27 (ISEC, SITE, LOIS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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)
Download PDF ISEC2018-64 SITE2018-42 LOIS2018-24

Conference Information
Committee SITE ISEC LOIS  
Conference Date 2018-11-03 - 2018-11-04 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2018-11-SITE-ISEC-LOIS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Statistical Method for Searching Biases of Stream Ciphers 
Sub Title (in English)  
Keyword(1) stream Cipher  
Keyword(2) biases  
Keyword(3) keystream  
1st Author's Name Seiya Tanamoto  
1st Author's Affiliation Tokai University (Tokai Univ)
2nd Author's Name Toshihiro Ohigashi  
2nd Author's Affiliation Tokai University (Tokai Univ)
3rd Author's Name Takanori Isobe  
3rd Author's Affiliation University of Hyogo (Univ. of Hyogo)
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Date Time 2018-11-03 11:00:00 
Presentation Time 30 
Registration for ISEC 
Paper # IEICE-ISEC2018-64,IEICE-SITE2018-42,IEICE-LOIS2018-24 
Volume (vol) IEICE-118 
Number (no) no.279(ISEC), no.280(SITE), no.281(LOIS) 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-ISEC-2018-10-27,IEICE-SITE-2018-10-27,IEICE-LOIS-2018-10-27 

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