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Paper Abstract and Keywords
Presentation 0000-00-00 00:00
An Identity Management System using Group Signatures with Message-Dependent Opening
Yuto Imura, Keita Emura (Kanazawa Univ.) IT2023-118 ISEC2023-117 WBS2023-106 RCC2023-100
Abstract (in Japanese) (See Japanese page) 
(in English) Isshiki et al. (ACM DRM 2006) proposed a privacy-preserving ID management system using group signatures (Isshiki system). The anonymity of group signatures allows the service provider to confirm that the user is a service user without having ID information such as a customer list. Billing for service fees utilizes the tracing capability of group signatures. In the Isshiki system, users can use services while concealing personal information such as hobbies and preferences, and customer lists can be prevented from leaking to subcontractors when subcontracting service provision. On the other hand, anonymity makes it impossible for outsiders to confirm whether services have actually been provided. Existing improved schemes introduce mechanisms to force billing (Fujitani et al. (AsiaJCIS2021)) or introduce publicly verifiable tracing result certificates (Emura-Hayashi (IEICE Trans. 2020)), but there is still the problem that billing is possible regardless of whether the service was provided or not, since service provision and group signature tracing are independent. In this paper, we utilize group signatures with message-dependent opening (GS-MDO) to improve the issues with the Isshiki system. Focusing on the fact that identity-based encryption (IBE) is essential in GS-MDO schemes, and IBE key generation becomes the signature, we introduce a mechanism where billing is only possible after the service provider issues a third-party verifiable service provision certificate. Furthermore, based on the implementation evaluation of the GS-MDO scheme by Ohara et al. (AsiaCCS 2013) (Arai et al. (IEICE Trans. 2021)), we evaluate the efficiency of the proposed system.
Keyword (in Japanese) (See Japanese page) 
(in English) Group Signatures / Group Signatures with Message-Dependent Opening / Identity Management System / / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 424, ISEC2023-117, pp. 267-272, March 2024.
Paper # ISEC2023-117 
Date of Issue 2024-03-06 (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)
Download PDF IT2023-118 ISEC2023-117 WBS2023-106 RCC2023-100

Conference Information
Committee RCC ISEC IT WBS  
Conference Date 2024-03-13 - 2024-03-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka Univ. (Suita Campus) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) RCC, ISEC, IT, WBS 
Paper Information
Registration To ISEC 
Conference Code 2024-03-RCC-ISEC-IT-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Identity Management System using Group Signatures with Message-Dependent Opening 
Sub Title (in English)  
Keyword(1) Group Signatures  
Keyword(2) Group Signatures with Message-Dependent Opening  
Keyword(3) Identity Management System  
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1st Author's Name Yuto Imura  
1st Author's Affiliation Kanazawa University (Kanazawa Univ.)
2nd Author's Name Keita Emura  
2nd Author's Affiliation Kanazawa University (Kanazawa Univ.)
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Date Time 0000-00-00 00:00:00 
Presentation Time minutes 
Registration for ISEC 
Paper # IT2023-118, ISEC2023-117, WBS2023-106, RCC2023-100 
Volume (vol) vol.123 
Number (no) no.423(IT), no.424(ISEC), no.425(WBS), no.426(RCC) 
Page pp.267-272 
#Pages 6 
Date of Issue 2024-03-06 (IT, ISEC, WBS, RCC) 

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