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Paper Abstract and Keywords
Presentation 2009-09-25 14:55
Constructing a Hash Function from a Weak Block Cipher in an Ideal Model
Shoichi Hirose (Univ. of Fukui.), Hidenori Kuwakado (Kobe Univ.) ISEC2009-47
Abstract (in Japanese) (See Japanese page) 
(in English) This paper discusses the provable security of block-cipher-based hash functions. It first introduces a new model called a weak ideal cipher model. In this model, an adversary is allowed to make key-disclosure queries to the oracle as well as encryption and decryption queries. A key-disclosure query is a pair of a plaintext and a ciphertext, and the reply is a corresponding key. Thus, in this model, a block cipher is random but completely insecure as a block cipher. It is shown that collision resistant hash functions can be constructed in this model. Hash functions indifferentiable from random oracles can also be constructed. This work is inspired by the compression function construction of a SHA-3 candidate Blue Midnight Wish. However, the results do not seem to have direct implications in its security.
Keyword (in Japanese) (See Japanese page) 
(in English) Hash function / Provable security / Collision resistance / Indifferentiability / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 207, ISEC2009-47, pp. 51-58, Sept. 2009.
Paper # ISEC2009-47 
Date of Issue 2009-09-18 (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 ISEC2009-47

Conference Information
Committee ISEC  
Conference Date 2009-09-25 - 2009-09-25 
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 2009-09-ISEC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Constructing a Hash Function from a Weak Block Cipher in an Ideal Model 
Sub Title (in English)  
Keyword(1) Hash function  
Keyword(2) Provable security  
Keyword(3) Collision resistance  
Keyword(4) Indifferentiability  
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Keyword(8)  
1st Author's Name Shoichi Hirose  
1st Author's Affiliation University of Fukui (Univ. of Fukui.)
2nd Author's Name Hidenori Kuwakado  
2nd Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2009-09-25 14:55:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2009-47 
Volume (vol) vol.109 
Number (no) no.207 
Page pp.51-58 
#Pages 8 
Date of Issue 2009-09-18 (ISEC) 

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