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Paper Abstract and Keywords
Presentation 2016-09-02 16:00
[Invited Talk] Adaptively Secure Identity-Based Encryption Scheme from Lattices with Asymptotically Shorter Public Parameters
Shota Yamada (AIST) ISEC2016-48
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we present two new adaptively secure identity-based encryption schemes from lattices. The size of the public parameters, ciphertexts, and private keys are $tilde{O}(n^2 kappa^{1/d})$, $tilde{O}(n)$, and $tilde{O}(n)$ respectively. Here, $n$ is the security parameter, $kappa$ is the length of the identity, and $din mathbb{N}$ is a flexible constant number that can be set arbitrary. Ignoring the poly-logarithmic factors hidden in the asymptotic notation, our schemes
achieve the best efficiency among existing adaptively secure IBE schemes from lattices.

In more detail, our first scheme is anonymous, but proven secure under the LWE assumption with approximation factor $n^{omega(1)}$. Our second scheme is not anonymous, but proven adaptively secure assuming the LWE assumption for all polynomial approximation factors.

Furthermore, based on a similar idea, we show an attribute-based encryption for branching programs that simultaneously satisfy the following properties for the first time: The construction achieves compact secret keys, the security is proven from the LWE assumption with polynomial approximation factor, and the scheme can deal with unbounded length branching programs.
Keyword (in Japanese) (See Japanese page) 
(in English) identity-based encryption / adaptive security / lattices / short public parameters / / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 207, ISEC2016-48, pp. 59-59, Sept. 2016.
Paper # ISEC2016-48 
Date of Issue 2016-08-26 (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)
Download PDF ISEC2016-48

Conference Information
Committee ISEC  
Conference Date 2016-09-02 - 2016-09-02 
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 2016-09-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Adaptively Secure Identity-Based Encryption Scheme from Lattices with Asymptotically Shorter Public Parameters 
Sub Title (in English)  
Keyword(1) identity-based encryption  
Keyword(2) adaptive security  
Keyword(3) lattices  
Keyword(4) short public parameters  
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1st Author's Name Shota Yamada  
1st Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
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Speaker Author-1 
Date Time 2016-09-02 16:00:00 
Presentation Time 30 minutes 
Registration for ISEC 
Paper # ISEC2016-48 
Volume (vol) vol.116 
Number (no) no.207 
Page p.59 
#Pages 1 
Date of Issue 2016-08-26 (ISEC) 

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