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Paper Abstract and Keywords
Presentation 2018-07-25 13:40
[Invited Talk] Obfustopia Built on Secret-Key Functional Encryption (from EUROCRYPT 2018)
Fuyuki Kitagawa (Tokyo Tech), Ryo Nishimaki (NTT), Keisuke Tanaka (Tokyo Tech) ISEC2018-23 SITE2018-15 HWS2018-20 ICSS2018-26 EMM2018-22
Abstract (in Japanese) (See Japanese page) 
(in English) We show that indistinguishability obfuscation (IO) for all circuits can be constructed solely from secret-key functional encryption (SKFE). In the construction, SKFE need to be able to issue a-priori unbounded number of functional keys, that is, collusion-resistant. Our strategy is to replace public-key functional encryption (PKFE) in the construction of IO proposed by Bitansky and Vaikuntanathan (FOCS 2015) with ¥emph{puncturable SKFE}. Bitansky and Vaikuntanathan introduced the notion of puncturable SKFE and observed that the strategy works. However, it has not been clear whether we can construct puncturable SKFE without assuming PKFE. In particular, it has not been known whether puncturable SKFE is constructed from ordinary SKFE. In this work, we show that a relaxed variant of puncturable SKFE can be constructed from collusion-resistant SKFE. Moreover, we show that the relaxed variant of puncturable SKFE is sufficient for constructing IO.
Keyword (in Japanese) (See Japanese page) 
(in English) secret-key functional encryption / indistinguishability obfuscation / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 151, ISEC2018-23, pp. 91-91, July 2018.
Paper # ISEC2018-23 
Date of Issue 2018-07-18 (ISEC, SITE, HWS, ICSS, EMM) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Copyright
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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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF ISEC2018-23 SITE2018-15 HWS2018-20 ICSS2018-26 EMM2018-22

Conference Information
Committee HWS ISEC SITE ICSS EMM IPSJ-CSEC IPSJ-SPT  
Conference Date 2018-07-25 - 2018-07-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security, etc. 
Paper Information
Registration To ISEC 
Conference Code 2018-07-HWS-ISEC-SITE-ICSS-EMM-CSEC-SPT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Obfustopia Built on Secret-Key Functional Encryption (from EUROCRYPT 2018) 
Sub Title (in English)  
Keyword(1) secret-key functional encryption  
Keyword(2) indistinguishability obfuscation  
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1st Author's Name Fuyuki Kitagawa  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Ryo Nishimaki  
2nd Author's Affiliation NTT Secure Platform Laboratories (NTT)
3rd Author's Name Keisuke Tanaka  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker
Date Time 2018-07-25 13:40:00 
Presentation Time 30 
Registration for ISEC 
Paper # IEICE-ISEC2018-23,IEICE-SITE2018-15,IEICE-HWS2018-20,IEICE-ICSS2018-26,IEICE-EMM2018-22 
Volume (vol) IEICE-118 
Number (no) no.151(ISEC), no.152(SITE), no.153(HWS), no.154(ICSS), no.155(EMM) 
Page p.91 
#Pages IEICE-1 
Date of Issue IEICE-ISEC-2018-07-18,IEICE-SITE-2018-07-18,IEICE-HWS-2018-07-18,IEICE-ICSS-2018-07-18,IEICE-EMM-2018-07-18 


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