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Paper Abstract and Keywords
Presentation 2007-07-20 10:20
Analysis on the Key-Scheduling Algorithm of MICKEY
Yoshiaki Fujikawa, Toshihiro Ohigashi, Hidenori Kuwakado, Masakatu Morii (Kobe Univ.) ISEC2007-46
Abstract (in Japanese) (See Japanese page) 
(in English) MICKEY and MICKEY-128, which are stream ciphers submitted to the ECRYPT Stream Cipher Project (eSTREAM), use a 80-bit secret key and a 128-bit one, respectively. MICKEY and MICKEY-128 are candidates on Phase 3 of eSTREAM. However, no critical attack against MICKEY and MICKEY-128 have been proposed, and the security evaluation against them is continued now. In this paper, we study the one-wayness of the key-scheduling algorithm of MICKEY and MICKEY-128. We propose a method based on the meet-in-the-middle attack for recovering a secret key from a given initial state. The computational complexity of proposed method is less than the computational complexity of the brute force attack. We show that the computational complexity of recovering a secret key from a given initial state is about $2^{44}$ in MICKEY and about $2^{68}$ in MICKEY-128.
Keyword (in Japanese) (See Japanese page) 
(in English) streasm cipher / eSTREAM / MICKEY / key-scheduling algorithm / one-wayness / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 141, ISEC2007-46, pp. 9-16, July 2007.
Paper # ISEC2007-46 
Date of Issue 2007-07-13 (ISEC) 
ISSN Print edition: ISSN 0913-5685    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 ISEC SITE IPSJ-CSEC  
Conference Date 2007-07-19 - 2007-07-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Future University-Hakodate 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2007-07-ISEC-SITE-IPSJ-CSEC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis on the Key-Scheduling Algorithm of MICKEY 
Sub Title (in English)  
Keyword(1) streasm cipher  
Keyword(2) eSTREAM  
Keyword(3) MICKEY  
Keyword(4) key-scheduling algorithm  
Keyword(5) one-wayness  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yoshiaki Fujikawa  
1st Author's Affiliation Kobe University (Kobe Univ.)
2nd Author's Name Toshihiro Ohigashi  
2nd Author's Affiliation Kobe University (Kobe Univ.)
3rd Author's Name Hidenori Kuwakado  
3rd Author's Affiliation Kobe University (Kobe Univ.)
4th Author's Name Masakatu Morii  
4th Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2007-07-20 10:20:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-46 
Volume (vol) vol.107 
Number (no) no.141 
Page pp.9-16 
#Pages 8 
Date of Issue 2007-07-13 (ISEC) 

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