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Paper Abstract and Keywords
Presentation 2021-03-02 15:20
The linear probability of the stream cipher Salsa
Junru Li (Osaka Univ.), Atsuko Miyaji (Osaka Univ./JAIST) ICSS2020-51
Abstract (in Japanese) (See Japanese page) 
(in English) Salsa20 is a stream cipher designed by D.J. Bernstein in 2005. One of the effective attack methods applied to Salsa20 is a key recovery attack by differential cryptanalysis. The differential cryptanalysis is a method of discovering the non-randomness of cryptographic algorithms by tracking how input differences affect output differences. In this paper, we focused on the relationship between the output difference and the input difference at a specific position through Salsa’s Quarter round, and conducted an experiment to investigate the position of the input difference when the output difference appears. For a 1-bit input difference, the position survey is performed so that the probability of the output difference appearing is as far from 1/2 as possible and close to 1 or 0. As a result, we found a line format that can express the relationship between the output difference after one round and the position of the input difference, and proved it theoretically.
Keyword (in Japanese) (See Japanese page) 
(in English) stream cipher / Salsa20 / theory / / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 384, ICSS2020-51, pp. 150-153, March 2021.
Paper # ICSS2020-51 
Date of Issue 2021-02-22 (ICSS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
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 ICSS IPSJ-SPT  
Conference Date 2021-03-01 - 2021-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security, Trust, etc. 
Paper Information
Registration To ICSS 
Conference Code 2021-03-ICSS-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) The linear probability of the stream cipher Salsa 
Sub Title (in English)  
Keyword(1) stream cipher  
Keyword(2) Salsa20  
Keyword(3) theory  
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1st Author's Name Junru Li  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Atsuko Miyaji  
2nd Author's Affiliation Osaka University/Japan Advanced Institute of Science and Technology (Osaka Univ./JAIST)
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Speaker Author-1 
Date Time 2021-03-02 15:20:00 
Presentation Time 25 minutes 
Registration for ICSS 
Paper # ICSS2020-51 
Volume (vol) vol.120 
Number (no) no.384 
Page pp.150-153 
#Pages 4 
Date of Issue 2021-02-22 (ICSS) 

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