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Paper Abstract and Keywords
Presentation 2018-03-07 14:50
Safety evaluation of stream cipher, Salsa20/ChaCha20 by redesign of diffusion
Yusuke Matsuoka, Atsuko Miyaji (Osaka Univ.) ICSS2017-62
Abstract (in Japanese) (See Japanese page) 
(in English) As of April 2016, in newly proposed TLS1.3, as encryption methods of symmetric key encryption scheme, AES in the block encryption and ChaCha20 in the stream encryption are adopted.However,ChaCha20 doesn't have sufficient safey evaluation like AES.ChaCha20 was proposed as a variant of Salsa 20, and the analysis of Salsa 20 is important as the first step in understanding the improvement to ChaCha20 and the design of stream cipher.
As a method of evaluating the safety of Salsa 20/ChaCha 20, there is a method using diffusion, but the method has not been established.In this research, we evaluate the safety by newly designing diffusion evaluation criteria and conditions for Salsa 20/ChaCha 20.
Keyword (in Japanese) (See Japanese page) 
(in English) Stream Cipher / Salsa20 / ChaCha20 / Diffusion / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 481, ICSS2017-62, pp. 67-72, March 2018.
Paper # ICSS2017-62 
Date of Issue 2018-02-28 (ICSS) 
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)
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Conference Information
Committee ICSS IPSJ-SPT  
Conference Date 2018-03-07 - 2018-03-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Hokubu Koyou Nouryoku Kaihatsu Sougou Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security, Trust, etc. 
Paper Information
Registration To ICSS 
Conference Code 2018-03-ICSS-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Safety evaluation of stream cipher, Salsa20/ChaCha20 by redesign of diffusion 
Sub Title (in English)  
Keyword(1) Stream Cipher  
Keyword(2) Salsa20  
Keyword(3) ChaCha20  
Keyword(4) Diffusion  
1st Author's Name Yusuke Matsuoka  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Atsuko Miyaji  
2nd Author's Affiliation Osaka University (Osaka Univ.)
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Date Time 2018-03-07 14:50:00 
Presentation Time 25 
Registration for ICSS 
Paper # IEICE-ICSS2017-62 
Volume (vol) IEICE-117 
Number (no) no.481 
Page pp.67-72 
#Pages IEICE-6 
Date of Issue IEICE-ICSS-2018-02-28 

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