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Paper Abstract and Keywords
Presentation 2015-11-06 16:45
Reducing Authentication Time in Blacklistable Anonymous Credential System Using Accumulator
Yuu Aikou, Toru Nakanishi (Hiroshima Univ) ISEC2015-47 SITE2015-34 LOIS2015-41
Abstract (in Japanese) (See Japanese page) 
(in English) In current ID-based user authentication schemes, privacy issues may occur, since users' behavior histories are collected in Service Providers (SPs). Although anonymous authentications such as group signatures have been proposed, these schemes rely on a Trusted Third Party (TTP) capable of tracing misbehaving users. Thus, the privacy is not high, because TTP can allways trace users. Therefore, the anonymous authentication using a blacklist without TTP has been proposed. However, since the computation time required for the authentication depends on the number of tickets in the blacklist, the authentication time is increased if lots of users are revoked. In this paper, we propose a new blacklistable anonymous credential scheme using an accumulator which can compress multiple elements and prove the inclusion of sets of elements. Then, we show the effectiveness of the proposed scheme by implementing it on a PC. From the measurement results, we confirm that the proposed scheme can achieve faster authentications than the previous shceme,in proper settings of parameters.
Keyword (in Japanese) (See Japanese page) 
(in English) Anonymous authentication / Blacklist / Accumulator / / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 293, ISEC2015-47, pp. 75-80, Nov. 2015.
Paper # ISEC2015-47 
Date of Issue 2015-10-30 (ISEC, SITE, LOIS) 
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 LOIS ISEC SITE  
Conference Date 2015-11-06 - 2015-11-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Kanagawa Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2015-11-LOIS-ISEC-SITE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reducing Authentication Time in Blacklistable Anonymous Credential System Using Accumulator 
Sub Title (in English)  
Keyword(1) Anonymous authentication  
Keyword(2) Blacklist  
Keyword(3) Accumulator  
1st Author's Name Yuu Aikou  
1st Author's Affiliation Hiroshima University (Hiroshima Univ)
2nd Author's Name Toru Nakanishi  
2nd Author's Affiliation Hiroshima University (Hiroshima Univ)
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Speaker Author-1 
Date Time 2015-11-06 16:45:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2015-47, SITE2015-34, LOIS2015-41 
Volume (vol) vol.115 
Number (no) no.293(ISEC), no.294(SITE), no.295(LOIS) 
Page pp.75-80 
Date of Issue 2015-10-30 (ISEC, SITE, LOIS) 

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