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Paper Abstract and Keywords
Presentation 2017-11-10 16:10
Revocable Hierarchical Identity-Based Encryption based on LWE Assumption
Atsushi Takayasu, Shuichi Katsumata (Univ. Tokyo), Takahiro Matsuda (AIST) ISEC2017-71 SITE2017-53 LOIS2017-48
Abstract (in Japanese) (See Japanese page) 
(in English) Revocable hierarchical identity-based encryption~(RHIBE) is an advanced form of standard identity-based encryption. RHIBE is useful in practice since it supports key revocation mechanism and key delegation functionality, simultaneously. Boldyreva et al.~(ACM CCS'08) proposed the first revocable identity-based encryption scheme~(RIBE), then Seo and Emura~(CT-RSA'13, CT-RSA'15) proposed the first RHIBE schemes. Based on the Seo-Emura construction, there are several subsequent works to achieve better efficiency or stronger security. However, current best possible construction based on the LWE assumption is RIBE; no lattice-based RHIBE schemes are known thus far. Technical hardness for the construction is due to incompatibility of revocation and delegation from lattices. In this work, we propose the first RHIBE scheme based on the LWE assumption. In our construction, to avoid the above incompatibility, we introduce two-dimensional {¥em level} for ciphertexts and decryption keys.
Furthermore, to produce key updates appropriately, we use secret {¥em level conversion keys} that are the most technically interesting points in our construction.
Keyword (in Japanese) (See Japanese page) 
(in English) revocable (hierarchical) identity-based encryption / lattice-based cryptography / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 285, ISEC2017-71, pp. 129-136, Nov. 2017.
Paper # ISEC2017-71 
Date of Issue 2017-11-02 (ISEC, SITE, LOIS) 
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)
Download PDF ISEC2017-71 SITE2017-53 LOIS2017-48

Conference Information
Committee LOIS ISEC SITE  
Conference Date 2017-11-09 - 2017-11-10 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2017-11-LOIS-ISEC-SITE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Revocable Hierarchical Identity-Based Encryption based on LWE Assumption 
Sub Title (in English)  
Keyword(1) revocable (hierarchical) identity-based encryption  
Keyword(2) lattice-based cryptography  
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1st Author's Name Atsushi Takayasu  
1st Author's Affiliation The University of Tokyo (Univ. Tokyo)
2nd Author's Name Shuichi Katsumata  
2nd Author's Affiliation The University of Tokyo (Univ. Tokyo)
3rd Author's Name Takahiro Matsuda  
3rd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
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Speaker Author-1 
Date Time 2017-11-10 16:10:00 
Presentation Time 30 minutes 
Registration for ISEC 
Paper # ISEC2017-71, SITE2017-53, LOIS2017-48 
Volume (vol) vol.117 
Number (no) no.285(ISEC), no.286(SITE), no.287(LOIS) 
Page pp.129-136 
#Pages 8 
Date of Issue 2017-11-02 (ISEC, SITE, LOIS) 

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