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Paper Abstract and Keywords
Presentation 2023-05-17 15:55
[Invited Talk] An Efficient Strategy to Construct a Better Differential on Multiple-Branch-Based Designs: Application to Orthros (from CT-RSA 2023)
Kazuma Taka, Kosei Sakamoto (Hyogo Univ.), Tatsuya Ishikawa (WDB KOUGAKU Co.,Ltd.), Takanori Isobe (Hyogo Univ.) ISEC2023-12
Abstract (in Japanese) (See Japanese page) 
(in English) As low-latency designs tend to have a small number of rounds to decrease latency, the differential-type cryptanalysis can become a significant threat to them.
In particular, since a multiple-branch-based design, such as {sf Orthros} can have the strong clustering effect on differential attacks due to its large internal state, it is crucial to investigate the impact of the clustering effect in such a design.
In this paper, we present a new SAT-based automatic search method for evaluating the clustering effect in the multiple-branch-based design.
By exploiting an inherent trait of multiple-branch-based designs, our method enables highly efficient evaluations of clustering effects on this-type designs.
We apply our method to the low-latency PRF {sf Orthros}, and show a best differential distinguisher reaching up to 7 rounds of {sf Orthros} with $2^{116.806}$ time/data complexity and 9-round distinguisher for each underlying permutation which is 2 more rounds than known longest distinguishers.
Besides, we update the designer's security bound for differential attacks based on the lower bounds for the number of active S-boxes, and obtain the optimal differential characteristic of {sf Orthros}, {sf Branch 1}, and {sf Branch 2} for the first time.
Consequently, we improve the designer's security bound from 9/12/12 to 7/10/10 rounds for {sf Orthros}/{sf Branch 1}/{sf Branch 2} based on a single differential characteristic.
Keyword (in Japanese) (See Japanese page) 
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Reference Info. IEICE Tech. Rep., vol. 123, no. 26, ISEC2023-12, pp. 65-65, May 2023.
Paper # ISEC2023-12 
Date of Issue 2023-05-10 (ISEC) 
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)
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Conference Information
Committee ISEC  
Conference Date 2023-05-17 - 2023-05-17 
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 2023-05-ISEC 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Efficient Strategy to Construct a Better Differential on Multiple-Branch-Based Designs: Application to Orthros (from CT-RSA 2023) 
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1st Author's Name Kazuma Taka  
1st Author's Affiliation University of Hyogo (Hyogo Univ.)
2nd Author's Name Kosei Sakamoto  
2nd Author's Affiliation University of Hyogo (Hyogo Univ.)
3rd Author's Name Tatsuya Ishikawa  
3rd Author's Affiliation WDB KOUGAKU (WDB KOUGAKU Co.,Ltd.)
4th Author's Name Takanori Isobe  
4th Author's Affiliation University of Hyogo (Hyogo Univ.)
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Date Time 2023-05-17 15:55:00 
Presentation Time 30 minutes 
Registration for ISEC 
Paper # ISEC2023-12 
Volume (vol) vol.123 
Number (no) no.26 
Page p.65 
#Pages
Date of Issue 2023-05-10 (ISEC) 


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