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Paper Abstract and Keywords
Presentation 2013-09-13 15:05
A Proposal of Extended Anonymous Credential Scheme with Ecient Proof of Age Inequality
Shahidatul Sadiah, Toru Nakanishi, Kan Watanabe, Nobuo Funabiki (Okayama Univ.) ISEC2013-54
Abstract (in Japanese) (See Japanese page) 
(in English) An anonymous credential system on attributes allows a user to convince a service provider anonymously that he/she owns a certified attribute. Previously, an anonymous credential system to prove that user attributes
satisfy a CNF formula on attributes was proposed. However, the system needs a large public key (PK) size and thus the large computation times, when proving the age inequation using the birthday attribute, because each birthday is assigned to one attribute and each attribute is mapped to one public parameter. In this paper, to reduce the PK size and computation times, we use the idea of dividing the birthday (year/month/day) attribute into the year, the month, and the day attributes. Consequently, the PK size is decreased, since the number of attributes is reduced to approximately 0.3%. In case of proving the age inequation, these attributes have to be expressed using monotone logic formulas. To adopt this idea on previous system, we extend the accumulator in the previous system and we propose an anonymous credential system to prove monotonic formulas. Also, we show the effectiveness of proposed system by measuring the process times for the implementation.
Keyword (in Japanese) (See Japanese page) 
(in English) Anonymity / Attributes / Anonymous certificate / / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 217, ISEC2013-54, pp. 21-28, Sept. 2013.
Paper # ISEC2013-54 
Date of Issue 2013-09-06 (ISEC) 
ISSN Print edition: ISSN 0913-5685    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)
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Conference Information
Committee ISEC  
Conference Date 2013-09-13 - 2013-09-13 
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 2013-09-ISEC 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Proposal of Extended Anonymous Credential Scheme with Ecient Proof of Age Inequality 
Sub Title (in English)  
Keyword(1) Anonymity  
Keyword(2) Attributes  
Keyword(3) Anonymous certificate  
Keyword(4)  
Keyword(5)  
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1st Author's Name Shahidatul Sadiah  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Toru Nakanishi  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Kan Watanabe  
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 2013-09-13 15:05:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2013-54 
Volume (vol) vol.113 
Number (no) no.217 
Page pp.21-28 
#Pages 8 
Date of Issue 2013-09-06 (ISEC) 

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