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Paper Abstract and Keywords
Presentation 2010-11-05 13:25
A Timed-Release Proxy Re-Encryption Scheme and its Applications
Keita Emura, Atsuko Miyaji, Kazumasa Omote (JAIST) ICSS2010-48
Abstract (in Japanese) (See Japanese page) 
(in English) Timed-Release Encryption (TRE) prevents even a legitimate recipient decrypting a ciphertext before a semi-trusted Time Server (TS) sends trapdoor $s_T$ assigned with a release time $T$ of the encryptor's choice.
Cathalo et al. (ICICS2005) and Chalkias et al. (ESORICS2007) have already considered encrypting a message intended to multiple recipients with the same release time.
One drawback of these schemes is the ciphertext size and computational complexity,
which depend on the number of recipients $N$.
In this paper, for the first time we propose Timed-Release Proxy Re-Encryption (TR-PRE) scheme.
Even if the proxy transformation is applied to a TRE ciphertext, the release time is still effective.
An encryptor can transfer $N$-dependent computation parts to the proxy.
This function can be applied to multicast communication with a release time indication.
Keyword (in Japanese) (See Japanese page) 
(in English) Timed-Release Encryption / Proxy Re-Encryption / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 266, ICSS2010-48, pp. 23-28, Nov. 2010.
Paper # ICSS2010-48 
Date of Issue 2010-10-29 (ICSS) 
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 ICSS  
Conference Date 2010-11-05 - 2010-11-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima City University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To ICSS 
Conference Code 2010-11-ICSS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Timed-Release Proxy Re-Encryption Scheme and its Applications 
Sub Title (in English)  
Keyword(1) Timed-Release Encryption  
Keyword(2) Proxy Re-Encryption  
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1st Author's Name Keita Emura  
1st Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
2nd Author's Name Atsuko Miyaji  
2nd Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
3rd Author's Name Kazumasa Omote  
3rd Author's Affiliation Japan Advanced Institute of Science and Technology (JAIST)
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Speaker Author-1 
Date Time 2010-11-05 13:25:00 
Presentation Time 25 minutes 
Registration for ICSS 
Paper # ICSS2010-48 
Volume (vol) vol.110 
Number (no) no.266 
Page pp.23-28 
#Pages 6 
Date of Issue 2010-10-29 (ICSS) 

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