Paper Abstract and Keywords |
Presentation |
2014-09-05 16:35
[Invited Talk]
Dual System Encryption via Doubly Selective Security
-- A Generic Framework for Fully-Secure Predicate Encryption -- Nuttapong Attrapadung (AIST) ISEC2014-54 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Dual system encryption techniques introduced by Waters in Crypto'09 are powerful approaches for constructing fully secure functional encryption (FE) for many predicates. However, there are still some FE for certain predicates to which dual system encryption techniques seem inapplicable, and hence their fully-secure realization remains an important problem. A notable example is FE for regular languages, introduced by Waters in Crypto'12.
We propose a generic framework that abstracts the concept of dual system encryption techniques. We introduce a new primitive called emph{pair encoding} scheme for predicates and show that it implies fully secure functional encryption (for the same predicates) via a generic construction. Using the framework, we obtain the first fully secure schemes for functional encryption primitives of which only selectively secure schemes were known so far. Our three main instantiations include FE for regular languages, unbounded attribute-based encryption (ABE) for large universes, and ABE with constant-size ciphertexts.
Our main ingredient for overcoming the barrier of inapplicability for the dual system techniques to certain predicates is a computational security notion of the pair encoding scheme which we call emph{doubly selective security}. This is in contrast with most of the previous dual system based schemes, where information-theoretic security are implicitly utilized. The doubly selective security notion resembles that of selective security and its complementary notion, co-selective security, and hence its name. Our framework can be regarded as a method for boosting doubly selectively security (of encoding) to full security (of functional encryption).
Besides generality of our framework, we remark that improved security is also obtained, as our security proof enjoys tighter reduction than previous schemes, notably the reduction cost does not depend on the number of all queries, but only that of emph{pre-challenged} queries. |
Keyword |
(in Japanese) |
(See Japanese page) |
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Reference Info. |
IEICE Tech. Rep., vol. 114, no. 203, ISEC2014-54, pp. 47-47, Sept. 2014. |
Paper # |
ISEC2014-54 |
Date of Issue |
2014-08-29 (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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ISEC2014-54 |
Conference Information |
Committee |
ISEC |
Conference Date |
2014-09-05 - 2014-09-05 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Kikai-Shinko-Kaikan Bldg. |
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Registration To |
ISEC |
Conference Code |
2014-09-ISEC |
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English |
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(See Japanese page) |
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Title (in English) |
Dual System Encryption via Doubly Selective Security |
Sub Title (in English) |
A Generic Framework for Fully-Secure Predicate Encryption |
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Nuttapong Attrapadung |
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The National Institute of Advanced Industrial Science and Technology (AIST) |
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Speaker |
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Date Time |
2014-09-05 16:35:00 |
Presentation Time |
30 minutes |
Registration for |
ISEC |
Paper # |
ISEC2014-54 |
Volume (vol) |
vol.114 |
Number (no) |
no.203 |
Page |
p.47 |
#Pages |
1 |
Date of Issue |
2014-08-29 (ISEC) |
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