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Paper Abstract and Keywords
Presentation 2008-09-12 15:20
Reduction of Public-Key Size in a Revocable Group Signature Scheme with Constant Costs for Signing and Verifying
Hiroki Fujii, Yuta Hira, Toru Nakanishi, Nobuo Funabiki (Okayama Univ.) ISEC2008-68
Abstract (in Japanese) (See Japanese page) 
(in English) Group signature scheme is the digital signature scheme enhancing the privacy of the user. We proposed a revocable scheme where signing and verifying require only $O(1)$ costs, while various schemes were previously proposed. However, the scheme has a problem that the public key size is $O(N)$. In this paper, we extend the scheme to reduce the public key size into $O(\sqrt{N})$. In addition, we implement it to confirm the reduction of the size and show that the scheme works at practical execution times.
Keyword (in Japanese) (See Japanese page) 
(in English) Group signature / anonymity / bilinear map / pairing / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 207, ISEC2008-68, pp. 33-38, Sept. 2008.
Paper # ISEC2008-68 
Date of Issue 2008-09-05 (ISEC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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 2008-09-12 - 2008-09-12 
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 2008-09-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reduction of Public-Key Size in a Revocable Group Signature Scheme with Constant Costs for Signing and Verifying 
Sub Title (in English)  
Keyword(1) Group signature  
Keyword(2) anonymity  
Keyword(3) bilinear map  
Keyword(4) pairing  
1st Author's Name Hiroki Fujii  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Yuta Hira  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Toru Nakanishi  
3rd Author's Affiliation Okayama University (Okayama Univ.)
4th Author's Name Nobuo Funabiki  
4th Author's Affiliation Okayama University (Okayama Univ.)
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Speaker Author-1 
Date Time 2008-09-12 15:20:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2008-68 
Volume (vol) vol.108 
Number (no) no.207 
Page pp.33-38 
Date of Issue 2008-09-05 (ISEC) 

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