Paper 2017/361
Indistinguishability Obfuscation for All Circuits from Secret-Key Functional Encryption
Fuyuki Kitagawa, Ryo Nishimaki, and Keisuke Tanaka
Abstract
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 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.
Note: Minor edits for presentation.
Metadata
- Available format(s)
-
PDF
- Category
- Foundations
- Publication info
- A major revision of an IACR publication in EUROCRYPT 2018
- Keywords
- Indistinguishability obfuscationSecret-key functional encryption
- Contact author(s)
-
kitagaw1 @ is titech ac jp
ryo nishimaki @ gmail com - History
- 2018-02-19: last of 7 revisions
- 2017-04-26: received
- See all versions
- Short URL
- https://ia.cr/2017/361
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2017/361,
author = {Fuyuki Kitagawa and Ryo Nishimaki and Keisuke Tanaka},
title = {Indistinguishability Obfuscation for All Circuits from Secret-Key Functional Encryption},
howpublished = {Cryptology {ePrint} Archive, Paper 2017/361},
year = {2017},
url = {https://eprint.iacr.org/2017/361}
}
