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Paper Abstract and Keywords
Presentation 2023-07-25 09:40
SAT-based Search of Related-key Impossible Distinguisher for Piccolo, TWINE, LBlock
Shion Utsumi (Univ. of Hyogo), Kosei Sakamoto (MELCO), Takanori Isobe (Univ. of Hyogo) ISEC2023-46 SITE2023-40 BioX2023-49 HWS2023-46 ICSS2023-43 EMM2023-46
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we evaluate security of Piccolo, TWINE, T-TWINE and LBlcok angainst on impossilbe related-key differential attacks.
Specifically, we use a SAT solver to explore bit-level related-key impossible differential distinguishers and estimate the maximum number of rounds for which distinguishers can be constructed.
As a result, we show that for Piccolo-128, depending on the starting round of ncryption, it is possible to construct distinguishers with a maximum of 13-16 rounds.
This result represents an improvement over the existing 12-round results by at least 1 round.
For TWINE-128, it is the first time that the exploration of related-key impossible differential distinguishers has been conducted, demonstrating the construction of distinguishers with 17 rounds under related-key settings.
For other primitives, although the maximum number of rounds for which a distinguisher can be constructed is the same as the existing results, it is the first time a rigorous search at the bit level is conducted.
Keyword (in Japanese) (See Japanese page) 
(in English) SAT / impossible differential / lightweight block cipher / Feistel structure / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 129, ISEC2023-46, pp. 208-213, July 2023.
Paper # ISEC2023-46 
Date of Issue 2023-07-17 (ISEC, SITE, BioX, HWS, ICSS, EMM) 
ISSN Online edition: ISSN 2432-6380
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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) SAT-based Search of Related-key Impossible Distinguisher for Piccolo, TWINE, LBlock 
Sub Title (in English)  
Keyword(1) SAT  
Keyword(2) impossible differential  
Keyword(3) lightweight block cipher  
Keyword(4) Feistel structure  
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1st Author's Name Shion Utsumi  
1st Author's Affiliation University of Hyogo (Univ. of Hyogo)
2nd Author's Name Kosei Sakamoto  
2nd Author's Affiliation Mitsubishi Electric Corporation (MELCO)
3rd Author's Name Takanori Isobe  
3rd Author's Affiliation University of Hyogo (Univ. of Hyogo)
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Speaker Author-1 
Date Time 2023-07-25 09:40:00 
Presentation Time 20 minutes 
Registration for ISEC 
Paper # ISEC2023-46, SITE2023-40, BioX2023-49, HWS2023-46, ICSS2023-43, EMM2023-46 
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.208-213 
#Pages
Date of Issue 2023-07-17 (ISEC, SITE, BioX, HWS, ICSS, EMM) 


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