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Paper Abstract and Keywords
Presentation 2007-05-18 16:50
On Equivalent Keys of Stream Ciphers
Ryoichi Teramura, Takanori Isobe, Toshihiro Ohigashi, Hidenori Kuwakado, Masakatu Morii (Kobe Univ.) ISEC2007-15
Abstract (in Japanese) (See Japanese page) 
(in English) When different keys are used in encryption, we call these keys equivalent keys
if ciphertexts generated from these keys have equivalence.
In general, the equivalent keys are the keys that generate same ciphertexts.
In the stream ciphers, the keys that generate pseudo-random sequence (called keystreams)
of different phase are also called equivalent keys
since the ciphertext is made by XORing the plaintext to the keystream
that is generated from a secret key and an initialization vector (IV).
In this paper, we present such equivalent keys searching method for stream ciphers.
We apply the proposed method to Grain v1 and Mickey 2.0 submitted to the ECRYPT Stream Cipher Project (eSTREAM).
We can obtain
equivalent keys (secret key and IV pairs) of these stream ciphers with small time complexity.
Additionally, we show that the space of equivalent keys identified by the proposed method
is about $1/2$ in all secret key and IV pairs.
Keyword (in Japanese) (See Japanese page) 
(in English) equivalent key / stream cipher / Grain v1 / Mickey 2.0 / eSTREAM / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 44, ISEC2007-15, pp. 101-108, May 2007.
Paper # ISEC2007-15 
Date of Issue 2007-05-11 (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)
Download PDF ISEC2007-15

Conference Information
Committee ISEC  
Conference Date 2007-05-18 - 2007-05-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2007-05-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On Equivalent Keys of Stream Ciphers 
Sub Title (in English)  
Keyword(1) equivalent key  
Keyword(2) stream cipher  
Keyword(3) Grain v1  
Keyword(4) Mickey 2.0  
Keyword(5) eSTREAM  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ryoichi Teramura  
1st Author's Affiliation Kobe University (Kobe Univ.)
2nd Author's Name Takanori Isobe  
2nd Author's Affiliation Kobe University (Kobe Univ.)
3rd Author's Name Toshihiro Ohigashi  
3rd Author's Affiliation Kobe University (Kobe Univ.)
4th Author's Name Hidenori Kuwakado  
4th Author's Affiliation Kobe University (Kobe Univ.)
5th Author's Name Masakatu Morii  
5th Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2007-05-18 16:50:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-15 
Volume (vol) vol.107 
Number (no) no.44 
Page pp.101-108 
#Pages 8 
Date of Issue 2007-05-11 (ISEC) 

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