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Paper Abstract and Keywords
Presentation 2022-11-18 16:20
Decentralization of Revocation Process Using Intermediate Servers in Revocable Group Signatures
Kai Kimura, Toru Nakanishi, Teruaki Kitasuka (Hiroshima Univ.) ISEC2022-41 SITE2022-45 LOIS2022-25
Abstract (in Japanese) (See Japanese page) 
(in English) A group signature is a signature method that allows a user who belongs to a group to prove that he or she ”belongs to the group” while maintaining anonymity. Crowdsensing is an example of the use of group signatures, where user location information is handled and privacy is protected by user authentication using group signatures. Currently, several efficient revocable group signature schemes for Crowdsensing have been proposed. However, these schemes need to send revocation lists to verifiers periodically, which is problematic when the data size is large and the verifiers are distributed. In our previous work, revocation lists were compressed using a Bloom filter to reduce the data size of the revocation list. However, in cases of V2V and V2I communications, the cost of revocation processing becomes large because a large number of verifiers are assumed. In this study, we propose an extended scheme, where intermediate servers are set up to distribute the computational load and the revocation data are reduced by using the Bloom filter used in our previous work. We furthermore verify the practicability by the implementation on a PC.
Keyword (in Japanese) (See Japanese page) 
(in English) group signatures / revocation / Bloom filter / privacy protection / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 258, ISEC2022-41, pp. 66-72, Nov. 2022.
Paper # ISEC2022-41 
Date of Issue 2022-11-11 (ISEC, SITE, LOIS) 
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 ISEC2022-41 SITE2022-45 LOIS2022-25

Conference Information
Committee ISEC SITE LOIS  
Conference Date 2022-11-18 - 2022-11-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2022-11-ISEC-SITE-LOIS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Decentralization of Revocation Process Using Intermediate Servers in Revocable Group Signatures 
Sub Title (in English)  
Keyword(1) group signatures  
Keyword(2) revocation  
Keyword(3) Bloom filter  
Keyword(4) privacy protection  
Keyword(5)  
Keyword(6)  
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1st Author's Name Kai Kimura  
1st Author's Affiliation Hiroshima University (Hiroshima Univ.)
2nd Author's Name Toru Nakanishi  
2nd Author's Affiliation Hiroshima University (Hiroshima Univ.)
3rd Author's Name Teruaki Kitasuka  
3rd Author's Affiliation Hiroshima University (Hiroshima Univ.)
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Speaker Author-1 
Date Time 2022-11-18 16:20:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2022-41, SITE2022-45, LOIS2022-25 
Volume (vol) vol.122 
Number (no) no.258(ISEC), no.259(SITE), no.260(LOIS) 
Page pp.66-72 
#Pages 7 
Date of Issue 2022-11-11 (ISEC, SITE, LOIS) 

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