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Paper Abstract and Keywords
Presentation 2023-07-25 10:00
Higher Order Differential Property of Block Cipher LBC-3
Naoki Shibayama, Yasutaka Igarashi (Tokyo Univ. of Science) ISEC2023-47 SITE2023-41 BioX2023-50 HWS2023-47 ICSS2023-44 EMM2023-47
Abstract (in Japanese) (See Japanese page) 
(in English) LBC-3 is a block cipher proposed by Nyssanbayeva et al. in 2022. The block size is 64-bit, the secret key size is 80-bit, and the recommended number of rounds is 20, respectively. The designer evaluated its security using the avalanche effect, and Yasushi et al. evaluated the security against differential cryptanalysis and linear cryptanalysis. On the other hand, it has not been reported the security against higher order differential cryptanalysis.
This paper shows a higher order differential of LBC-3. By the computer experiment, we found a new 12-round characteristic using 28-th order differential. Then, we also show a new 18-round characteristic using 60-th order differential which is a 6-round extension of the 12-round one to the direction to plaintext theoretically. By exploiting this characteristic, the full-round LBC-3 can be attacked with $2^{61.6}$ blocks of chosen plaintext and $2^{61.6}$ times of data encryption.
Keyword (in Japanese) (See Japanese page) 
(in English) Block Cipher / LBC-3 / Higher Order Differential Property / Cryptanalysis / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 129, ISEC2023-47, pp. 214-220, July 2023.
Paper # ISEC2023-47 
Date of Issue 2023-07-17 (ISEC, SITE, BioX, HWS, ICSS, EMM) 
ISSN 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 ISEC2023-47 SITE2023-41 BioX2023-50 HWS2023-47 ICSS2023-44 EMM2023-47

Conference Information
Committee EMM BioX ISEC SITE ICSS HWS IPSJ-CSEC IPSJ-SPT 
Conference Date 2023-07-24 - 2023-07-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Jichiro Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2023-07-EMM-BioX-ISEC-SITE-ICSS-HWS-CSEC-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Higher Order Differential Property of Block Cipher LBC-3 
Sub Title (in English)  
Keyword(1) Block Cipher  
Keyword(2) LBC-3  
Keyword(3) Higher Order Differential Property  
Keyword(4) Cryptanalysis  
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1st Author's Name Naoki Shibayama  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yasutaka Igarashi  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2023-07-25 10:00:00 
Presentation Time 20 minutes 
Registration for ISEC 
Paper # ISEC2023-47, SITE2023-41, BioX2023-50, HWS2023-47, ICSS2023-44, EMM2023-47 
Volume (vol) vol.123 
Number (no) no.129(ISEC), no.130(SITE), no.131(BioX), no.132(HWS), no.133(ICSS), no.134(EMM) 
Page pp.214-220 
#Pages 7 
Date of Issue 2023-07-17 (ISEC, SITE, BioX, HWS, ICSS, EMM) 

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