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Paper Abstract and Keywords
Presentation 2025-03-06 11:05
Efficient CCA-secure Public Key Encryption with Publicly Verifiability
Masaya Yoshimura (UEC), Kyoichi Asano (UEC/AIST), Mitsugu Iwamoto (UEC), Yohei Watanabe (UEC/AIST) IT2024-105 ISEC2024-119 WBS2024-102 RCC2024-107
Abstract (in Japanese) (See Japanese page) 
(in English) Public-key encryption (PKE) is said to be publicly verifiable if one can check the consistency of ciphertexts with only the public key. Public verifiability is critical in advanced cryptographic protocols such as threshold PKE and updatable PKE, yet many existing PKE schemes do not have the property. Previous approaches to efficiently achieve public verifiability have employed techniques like the Canetti--Halevi--Katz (CHK) transformation and constructions based on Quasi-Adaptive Non-Interactive Zero-Knowledge (QA-NIZK) proofs; however, these methods require pairing operations either in the construction or in the security proofs. In this paper, we propose a novel, pairing-free PKE scheme that is both CCA-secure and publicly verifiable in the standard model under standard computational assumptions. Our construction is realized by applying the CHK transformation and its variants to the Jutla-Roy Identity-Based Encryption (IBE) scheme, which itself is based on the combination of the Cramer-Shoup PKE and QA-NIZK techniques.
Keyword (in Japanese) (See Japanese page) 
(in English) public-key encryption / CCA secure / public verifiability / / / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 397, ISEC2024-119, pp. 208-215, March 2025.
Paper # ISEC2024-119 
Date of Issue 2025-02-26 (IT, ISEC, WBS, RCC) 
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)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
Download PDF IT2024-105 ISEC2024-119 WBS2024-102 RCC2024-107

Conference Information
Committee WBS ISEC IT RCC  
Conference Date 2025-03-05 - 2025-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Nakanoshima Center, Osaka University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Joint Workshop of ISEC, IT, RCC, and WBS 
Paper Information
Registration To ISEC 
Conference Code 2025-03-WBS-ISEC-IT-RCC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Efficient CCA-secure Public Key Encryption with Publicly Verifiability 
Sub Title (in English)  
Keyword(1) public-key encryption  
Keyword(2) CCA secure  
Keyword(3) public verifiability  
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1st Author's Name Masaya Yoshimura  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Kyoichi Asano  
2nd Author's Affiliation The University of Electro-Communications/National Institute of Advanced Industrial Science and Technology (UEC/AIST)
3rd Author's Name Mitsugu Iwamoto  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Yohei Watanabe  
4th Author's Affiliation The University of Electro-Communications/National Institute of Advanced Industrial Science and Technology (UEC/AIST)
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Speaker Author-1 
Date Time 2025-03-06 11:05:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2024-105, ISEC2024-119, WBS2024-102, RCC2024-107 
Volume (vol) vol.124 
Number (no) no.396(IT), no.397(ISEC), no.398(WBS), no.399(RCC) 
Page pp.208-215 
#Pages 8 
Date of Issue 2025-02-26 (IT, ISEC, WBS, RCC) 

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