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Paper Abstract and Keywords
Presentation 2004-07-21 14:05
Analysis and Evaluation of Guess-and-Determine Attacks on Clock Controlled Stream Ciphers
Shinsaku Kiyomoto, Toshiaki Tanaka (KDDI Labs.), Kouichi Sakurai (Kyushu Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Guess-and-Determine attacks have recently been proposed for the effective analysis of word-oriented stream ciphers.
In this paper, we discuss GD attacks on stream ciphers using a clock controller as a non-linear function.
We focus on analyzing the influence of the clock controller.
First, we model a stream ciphers and discuss a maximum process complexity of GD attacks for existing stream ciphers.
Next, we propose GD attacks on typical clock controlled stream ciphers,
which uses a clock controller. We remove the irregularity of clocking to use a assumption.
In the attacks, we assume some condition where, for example, clocking of LFSRs is truly random.
An important condition for practical attacks is the real probabilities of assumptions because the clocking is determined by current internal states.
We also implement toy ciphers of clock controlled stream ciphers to evaluate the proposed attacks, and evaluate feasibility
of the attacks. We also discuss properties of GD attacks on clock controlled stream ciphers
and the effectiveness of the clock controllers.
Keyword (in Japanese) (See Japanese page) 
(in English) A5 / Stream cipher / AA5 / Alpha-1 / Guess-and-Determine Attack / LILI-128 / LILI-II /  
Reference Info. IEICE Tech. Rep., vol. 104, no. 200, ISEC2004-49, pp. 53-60, July 2004.
Paper # ISEC2004-49 
Date of Issue 2004-07-14 (ISEC) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee ISEC IPSJ-CSEC  
Conference Date 2004-07-20 - 2004-07-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokushima Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2004-07-ISEC-JPSCSEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis and Evaluation of Guess-and-Determine Attacks on Clock Controlled Stream Ciphers 
Sub Title (in English)  
Keyword(1) A5  
Keyword(2) Stream cipher  
Keyword(3) AA5  
Keyword(4) Alpha-1  
Keyword(5) Guess-and-Determine Attack  
Keyword(6) LILI-128  
Keyword(7) LILI-II  
Keyword(8)  
1st Author's Name Shinsaku Kiyomoto  
1st Author's Affiliation KDDI R&D Laboratories Inc. (KDDI Labs.)
2nd Author's Name Toshiaki Tanaka  
2nd Author's Affiliation KDDI R&D Laboratories Inc. (KDDI Labs.)
3rd Author's Name Kouichi Sakurai  
3rd Author's Affiliation Kyushu University (Kyushu Univ.)
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Speaker Author-1 
Date Time 2004-07-21 14:05:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2004-49 
Volume (vol) vol.104 
Number (no) no.200 
Page pp.53-60 
#Pages
Date of Issue 2004-07-14 (ISEC) 


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