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Paper Abstract and Keywords
Presentation 2009-11-13 13:00
State Recovery of RC4 PRGA by Using Nonzero Bit Differences
Mitsuki Ajiro, Atsuko Miyaji (JAIST) ISEC2009-65 LOIS2009-54
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we focus on a keystream of RC4 PRGA. The analysis of the
transitions of two permutations, $S$ and $S'$, with some differences in the
initial round were argued in \cite{SMI08}\cite{SM08}\cite{MS09}. Recently the existence of colliding keys was shown theoretically in \cite{Matusi09} even if a secret key length is short.
In addition, the existence of pairs of the secret key that generate two
permutations, $S$ and $S'$, with two bytes differences in the initial round
was shown theoretically.
In this paper, we investigate how the structure mixes the permutation S by
observing correlation between two keystream $Z$ and $Z'$ which are generated by two permutations, S and S', with some
differences in the initial round. We show that we can suppose the part of the
initial permutation with the probability that is higher than the random.
Keyword (in Japanese) (See Japanese page) 
(in English) RC4 / Stream Cipher / Symmetric Cipher / Internal State Analysis / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 271, ISEC2009-65, pp. 95-100, Nov. 2009.
Paper # ISEC2009-65 
Date of Issue 2009-11-05 (ISEC, LOIS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 ISEC LOIS  
Conference Date 2009-11-12 - 2009-11-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Gifu Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2009-11-ISEC-LOIS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) State Recovery of RC4 PRGA by Using Nonzero Bit Differences 
Sub Title (in English)  
Keyword(1) RC4  
Keyword(2) Stream Cipher  
Keyword(3) Symmetric Cipher  
Keyword(4) Internal State Analysis  
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1st Author's Name Mitsuki Ajiro  
1st Author's Affiliation Japan Advanced Institute of science and technology (JAIST)
2nd Author's Name Atsuko Miyaji  
2nd Author's Affiliation Japan Advanced Institute of science and technology (JAIST)
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Speaker Author-1 
Date Time 2009-11-13 13:00:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2009-65, LOIS2009-54 
Volume (vol) vol.109 
Number (no) no.271(ISEC), no.272(LOIS) 
Page pp.95-100 
#Pages
Date of Issue 2009-11-05 (ISEC, LOIS) 


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