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Paper Abstract and Keywords
Presentation 2013-07-18 15:15
A Collision Attack on a Double-Block-Length Compression Function Instantiated with Round-Reduced AES-256
Jiageng Chen (JAIST), Shoichi Hirose (Univ. of Fukui), Hidenori Kuwakado (Kansai Univ.), Atsuko Miyaji (JAIST) ISEC2013-19 SITE2013-14 ICSS2013-24 EMM2013-21
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents the first collision attack on the double-block-length compression function presented at FSE 2006 instantiated with round-reduced AES-256: $f_0(h_0|h_1,M)|f_1(h_0|h_1,M)$ such that $f_0(h_0|h_1,M)=E_{h_1|M}(h_0)oplus h_0$ and $f_1(h_0|h_1,M)=E_{h_1|M}(h_0oplus c)oplus h_0oplus c$, where $|$ represents concatenation, $E$ is AES-256 and $c$ is a non-zero constant. The proposed attack is a free-start collision attack. It uses the rebound attack proposed by Mendel et al. It finds a collision with time complexity $2^{8}$ and $2^{64}$ for the instantiation with 6-round AES-256 and 8-round AES-256, respectively. The space complexity is negligible. The attack is effective only if the $16$-byte constant $c$ has a single non-zero byte. It still sheds light on a gap between the ideal world and the real world: The target double-block-length compression function is shown to be optimally collision-resistant in the ideal cipher model. It also suggests how not to choose the constant.
Keyword (in Japanese) (See Japanese page) 
(in English) hash function / compression function / AES / collision attack / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 135, ISEC2013-19, pp. 59-66, July 2013.
Paper # ISEC2013-19 
Date of Issue 2013-07-11 (ISEC, SITE, ICSS, EMM) 
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)
Download PDF ISEC2013-19 SITE2013-14 ICSS2013-24 EMM2013-21

Conference Information
Committee EMM ISEC SITE ICSS IPSJ-CSEC IPSJ-SPT  
Conference Date 2013-07-18 - 2013-07-19 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security 
Paper Information
Registration To ISEC 
Conference Code 2013-07-EMM-ISEC-SITE-ICSS-CSEC-SPT 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Collision Attack on a Double-Block-Length Compression Function Instantiated with Round-Reduced AES-256 
Sub Title (in English)  
Keyword(1) hash function  
Keyword(2) compression function  
Keyword(3) AES  
Keyword(4) collision attack  
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1st Author's Name Jiageng Chen  
1st Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
2nd Author's Name Shoichi Hirose  
2nd Author's Affiliation University of Fukui (Univ. of Fukui)
3rd Author's Name Hidenori Kuwakado  
3rd Author's Affiliation Kansai University (Kansai Univ.)
4th Author's Name Atsuko Miyaji  
4th Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
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Speaker Author-2 
Date Time 2013-07-18 15:15:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2013-19, SITE2013-14, ICSS2013-24, EMM2013-21 
Volume (vol) vol.113 
Number (no) no.135(ISEC), no.136(SITE), no.137(ICSS), no.138(EMM) 
Page pp.59-66 
#Pages
Date of Issue 2013-07-11 (ISEC, SITE, ICSS, EMM) 


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