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Paper Abstract and Keywords
Presentation 2007-12-19 16:10
Attribute-Based Encryption with Partially Hidden Ciphertext Policies
Takashi Nishide (Univ. of Electro-Comm./Hitachi Software), Kazuki Yoneyama, Kazuo Ohta (Univ. of Electro-Comm.) ISEC2007-125
Abstract (in Japanese) (See Japanese page) 
(in English) We propose an attribute-based encryption scheme where encryptor-specified
policies are hidden.
By using our scheme, an encryptor can encrypt data with a hidden access control policy.
A decryptor obtains her secret key associated with her attributes from a trusted authority and if the attributes associated with the decryptor's secret key do not satisfy the access control policy associated with the encrypted data, the decryptor cannot decrypt the data nor know
what access control policy was specified by the encryptor.
We prove security of our construction based on the Decisional
Blinear Diffie-Hellman assumption and the Decision Linear assumption.
In our security notion, even the legitimate decryptor cannot
obtain the information about the access control policy associated with
the encrypted data more than the fact that she can decrypt the data.
Keyword (in Japanese) (See Japanese page) 
(in English) / / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 397, ISEC2007-125, pp. 93-100, Dec. 2007.
Paper # ISEC2007-125 
Date of Issue 2007-12-12 (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 ISEC2007-125

Conference Information
Committee ISEC  
Conference Date 2007-12-19 - 2007-12-19 
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 2007-12-ISEC 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Attribute-Based Encryption with Partially Hidden Ciphertext Policies 
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1st Author's Name Takashi Nishide  
1st Author's Affiliation The University of Electro-Communications/Hitachi Software Engineering (Univ. of Electro-Comm./Hitachi Software)
2nd Author's Name Kazuki Yoneyama  
2nd Author's Affiliation The University of Electro-Communications (Univ. of Electro-Comm.)
3rd Author's Name Kazuo Ohta  
3rd Author's Affiliation The University of Electro-Communications (Univ. of Electro-Comm.)
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Speaker Author-1 
Date Time 2007-12-19 16:10:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-125 
Volume (vol) vol.107 
Number (no) no.397 
Page pp.93-100 
#Pages 8 
Date of Issue 2007-12-12 (ISEC) 

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