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Paper Abstract and Keywords
Presentation 2026-05-26 14:25
Efficient Lattice-based Forward Secure Signature without Random Oracles
Ren Ishibashi (Yokohama National Univ./Canon), Sohto Chiku, Junji Shikata (Yokohama National Univ.) ISEC2026-7
Abstract (in Japanese) (See Japanese page) 
(in English) Forward Secure Signature (FSS) is a digital signature scheme that ensures the security of signatures generated in the past even if the signing key used in the current period is compromised, by updating only the signing key at every time period while keeping the public key unchanged. The first lattice-based FSS scheme proposed by Tang et al. was constructed based on the structure of Hierarchical Identity-Based Encryption (HIBE), in which the sizes of the signing key and signatures grow depending on the number of key updates. Subsequently, Ishibashi et al. proposed a lattice-based FSS scheme with constant sizes of the signing key and signatures independent of the number of key updates. However, existing lattice-based FSS schemes only achieve selective security, and no lattice-based FSS scheme that achieves adaptive FS-EUF-CMA security in the standard model is known. In this paper, we propose the first FSS scheme that achieves adaptive existential unforgeability under chosen message attacks in the standard model under the ISIS assumption. Similar to the scheme by Ishibashi et al., our scheme provides constant sizes of the signing key and signatures independent of the number of key updates.
Keyword (in Japanese) (See Japanese page) 
(in English) Lattice / Digital Signature / Forward Security / Adaptive Security / Gadget Trapdoor / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 40, ISEC2026-7, pp. 14-21, May 2026.
Paper # ISEC2026-7 
Date of Issue 2026-05-19 (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 2026-05-26 - 2026-05-26 
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 2026-05-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Efficient Lattice-based Forward Secure Signature without Random Oracles 
Sub Title (in English)  
Keyword(1) Lattice  
Keyword(2) Digital Signature  
Keyword(3) Forward Security  
Keyword(4) Adaptive Security  
Keyword(5) Gadget Trapdoor  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ren Ishibashi  
1st Author's Affiliation Yokohama National University/Canon Inc. (Yokohama National Univ./Canon)
2nd Author's Name Sohto Chiku  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Junji Shikata  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
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Speaker Author-1 
Date Time 2026-05-26 14:25:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2026-7 
Volume (vol) vol.126 
Number (no) no.40 
Page pp.14-21 
#Pages 8 
Date of Issue 2026-05-19 (ISEC) 

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