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Paper Abstract and Keywords
Presentation 2021-03-05 09:00
Relationships among Security Notions and Lower Bounds on Tags in Anonymous Broadcast Authentication
Hirokazu Kobayashi (Yokohama National Univ..), Yohei Watanabe (The Univ. of Electro-Communications/AIST), Junji Shikata (Yokohama National Univ..) IT2020-143 ISEC2020-73 WBS2020-62
Abstract (in Japanese) (See Japanese page) 
(in English) Watanabe et al. (SCIS2021) proposed Anonymous Broadcast Authentication (ABA) as a cryptographic primitive for remote control systems over IoT networks. ABA is a message authentication scheme that allows a sender to specify recipients so that only the specified recipients can perform verification correctly. One of the security requirements for ABA is anonymity that requires that no information about the designated recipients is leaked from the authenticator, and Watanabe et al. gave indistinguishability-based definition of the anonymity for ABA. In this paper, we give a semantic security style definition of the anonymity for ABA, and show that it is equivalent to indistinguishability-based definition. We also show that, under a certain assumption, we can derive a lower bound on the size of authenticators in ABA and and show an optimality of Watanabe et al.'s constructions.
Keyword (in Japanese) (See Japanese page) 
(in English) Broadcast Authentication / Anonymity / Semantic Security / Lower Bound / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 411, ISEC2020-73, pp. 187-194, March 2021.
Paper # ISEC2020-73 
Date of Issue 2021-02-25 (IT, ISEC, WBS) 
ISSN 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 WBS IT ISEC  
Conference Date 2021-03-04 - 2021-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Joint Meeting of WBS, IT, and ISEC 
Paper Information
Registration To ISEC 
Conference Code 2021-03-WBS-IT-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Relationships among Security Notions and Lower Bounds on Tags in Anonymous Broadcast Authentication 
Sub Title (in English)  
Keyword(1) Broadcast Authentication  
Keyword(2) Anonymity  
Keyword(3) Semantic Security  
Keyword(4) Lower Bound  
1st Author's Name Hirokazu Kobayashi  
1st Author's Affiliation Yokohama National University (Yokohama National Univ..)
2nd Author's Name Yohei Watanabe  
2nd Author's Affiliation The University of Electro-Communications/National Institute of Advanced Industrial Science and Technology (The Univ. of Electro-Communications/AIST)
3rd Author's Name Junji Shikata  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ..)
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Speaker Author-1 
Date Time 2021-03-05 09:00:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2020-143, ISEC2020-73, WBS2020-62 
Volume (vol) vol.120 
Number (no) no.410(IT), no.411(ISEC), no.412(WBS) 
Page pp.187-194 
Date of Issue 2021-02-25 (IT, ISEC, WBS) 

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