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Paper Abstract and Keywords
Presentation 2007-07-20 11:10
On Construction of Block Cipher with Variable Security Parameter
Yasumasa Hirai, Shin'ichiro Matsuo (NTT DATA), Wakaha Ogata (Tokyo Inst. of Tech.) ISEC2007-48
Abstract (in Japanese) (See Japanese page) 
(in English) Currently, cryptographical technology such as an encryption algorithm is used in many IT systems. When an encryption scheme becomes insecure in computational sense, to fill the security requirement, we need to replace all IT systems which use the algorithm. Considering the cost, however, the replacement of IT systems outside the schedule is very difficult. In this research, we introduce the variable key length and the variable block size as ”security parameters” of the block cipher, and show some examples of block ciphers with security parameters. By using such block ciphers, we can easily enhance the security of IT systems without exchanging the algorithm, even if the block cipher becomes computationally insecure.
Keyword (in Japanese) (See Japanese page) 
(in English) system security / n times encryption / block cipher / algorithm compromise / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 141, ISEC2007-48, pp. 23-28, July 2007.
Paper # ISEC2007-48 
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 Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On Construction of Block Cipher with Variable Security Parameter 
Sub Title (in English)  
Keyword(1) system security  
Keyword(2) n times encryption  
Keyword(3) block cipher  
Keyword(4) algorithm compromise  
Keyword(5)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yasumasa Hirai  
1st Author's Affiliation NTT DATA Corporation (NTT DATA)
2nd Author's Name Shin'ichiro Matsuo  
2nd Author's Affiliation NTT DATA Corporation (NTT DATA)
3rd Author's Name Wakaha Ogata  
3rd Author's Affiliation Tokyo Institue of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2007-07-20 11:10:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-48 
Volume (vol) vol.107 
Number (no) no.141 
Page pp.23-28 
#Pages 6 
Date of Issue 2007-07-13 (ISEC) 

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