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| 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 |
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| 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 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 | ISEC2018-23 SITE2018-15 HWS2018-20 ICSS2018-26 EMM2018-22 |
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| 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 | Author-1 |
| Date Time | 2018-07-25 13:40:00 |
| Presentation Time | 30 minutes |
| Registration for | ISEC |
| Paper # | ISEC2018-23, SITE2018-15, HWS2018-20, ICSS2018-26, EMM2018-22 |
| Volume (vol) | vol.118 |
| Number (no) | no.151(ISEC), no.152(SITE), no.153(HWS), no.154(ICSS), no.155(EMM) |
| Page | p.91 |
| #Pages | 1 |
| Date of Issue | 2018-07-18 (ISEC, SITE, HWS, ICSS, EMM) |
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