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Paper Abstract and Keywords
Presentation 2024-11-15 12:40
The Optimum Reaction Attack on TFHE Fully Homomorphic Encryption
Remma Kumazaki, Yuichi Kaji (Nagoya Univ.) ISEC2024-80 SITE2024-77 LOIS2024-44
Abstract (in Japanese) (See Japanese page) 
(in English) A reaction attack is a realistic attacking method that can reveal the secret key of TFHE, a widely recognized fully homomorphic encryption scheme. In a reaction attack, an adversary sends modified or forged ciphertexts to a legitimate receiver, and try to learn secret information such as a key by observing the reaction of the receiver. In this attack, the receiver plays the role of an oracle, and the efficiency and the effectiveness of the attack is measured by the number of queries that are sent to the oracle. This study proposes a new reaction attack by improving the search algorithm that is used in existing attacks, and shows that the proposed attack needs less number of queries than those existing attacking schemes. The paper also discusses the number of queries from the information theoretic aspects, and shows that the number of queries necessary to complete a reaction attack is lowerbounded by the entropy of the plaintext and the noise of THFE. It is also shown that the proposed attacking method almostly achieves this lowerbound and thus is optimum among all reaction attacks.
Keyword (in Japanese) (See Japanese page) 
(in English) fully homomorphic encryption / TFHE / reaction attack / information theory / entropy / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 255, ISEC2024-80, pp. 118-125, Nov. 2024.
Paper # ISEC2024-80 
Date of Issue 2024-11-07 (ISEC, SITE, LOIS) 
ISSN Online edition: ISSN 2432-6380
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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 ISEC2024-80 SITE2024-77 LOIS2024-44

Conference Information
Committee SITE LOIS ISEC  
Conference Date 2024-11-14 - 2024-11-15 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2024-11-SITE-LOIS-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) The Optimum Reaction Attack on TFHE Fully Homomorphic Encryption 
Sub Title (in English)  
Keyword(1) fully homomorphic encryption  
Keyword(2) TFHE  
Keyword(3) reaction attack  
Keyword(4) information theory  
Keyword(5) entropy  
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1st Author's Name Remma Kumazaki  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Yuichi Kaji  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
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Speaker Author-1 
Date Time 2024-11-15 12:40:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2024-80, SITE2024-77, LOIS2024-44 
Volume (vol) vol.124 
Number (no) no.255(ISEC), no.256(SITE), no.257(LOIS) 
Page pp.118-125 
#Pages 8 
Date of Issue 2024-11-07 (ISEC, SITE, LOIS) 

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