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Paper Abstract and Keywords
Presentation 2021-03-02 13:55
Mutual Secrecy of Attributes and Authorization Policies in Identity Federation
Satsuki Nishioka, Yasuo Okabe (Kyoto Univ.) SITE2020-53 IA2020-49
Abstract (in Japanese) (See Japanese page) 
(in English) In modern Web services, authentication federation that separates the Identity Provider (IdP), which centrally manages authentication information such as user passwords, from the service provider (SP) is commonly used. Authorization federation in which the IdP further manages user attributes, the IdP provides attribute values to the SP, and the SP decides whether to provide the service, is used as well. However, more information about attribute values is often passed to the SP than is necessary for the authorization decision. There also are cases in which it is necessary to keep the authorization policies secret from the IdP and the user. Information that should be concealed may be narrowed down through multiple authorization processes, even if attributes and authorization policies can be kept secret from each other in a single authorization process. If an authorization policy of the SP is logical expression of predicates, the expression needs to be disclosed to the IdP. In this work, we point out and formulate these problems and provide some protocols to solve them.
Keyword (in Japanese) (See Japanese page) 
(in English) identity federation / authorization policy / attribute / oblivious transfer / Binary Decision Diagram (BDD) / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 381, IA2020-49, pp. 93-100, March 2021.
Paper # IA2020-49 
Date of Issue 2021-02-22 (SITE, IA) 
ISSN 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 SITE2020-53 IA2020-49

Conference Information
Committee SITE IA IPSJ-IOT  
Conference Date 2021-03-01 - 2021-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IA 
Conference Code 2021-03-SITE-IA-IOT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Mutual Secrecy of Attributes and Authorization Policies in Identity Federation 
Sub Title (in English)  
Keyword(1) identity federation  
Keyword(2) authorization policy  
Keyword(3) attribute  
Keyword(4) oblivious transfer  
Keyword(5) Binary Decision Diagram (BDD)  
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1st Author's Name Satsuki Nishioka  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Yasuo Okabe  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2021-03-02 13:55:00 
Presentation Time 25 minutes 
Registration for IA 
Paper # SITE2020-53, IA2020-49 
Volume (vol) vol.120 
Number (no) no.380(SITE), no.381(IA) 
Page pp.93-100 
#Pages 8 
Date of Issue 2021-02-22 (SITE, IA) 

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