Paper 2016/425

Multi-Input Inner-Product Functional Encryption from Pairings

Michel Abdalla, Romain Gay, Mariana Raykova, and Hoeteck Wee

Abstract

We present a multi-input functional encryption scheme (MIFE) for the inner product functionality based on the k-Lin assumption in prime-order bilinear groups. Our construction works for any polynomial number of encryption slots and achieves adaptive security against unbounded collusion, while relying on standard polynomial hardness assumptions. Prior to this work, we did not even have a candidate for 3-slot MIFE for inner products in the generic bilinear group model. Our work is also the first MIFE scheme for a non-trivial functionality based on standard cryptographic assumptions, as well as the first to achieve polynomial security loss for a super-constant number of slots under falsifiable assumptions. Prior works required stronger non-standard assumptions such as indistinguishability obfuscation or multi-linear maps.

Metadata
Available format(s)
PDF
Publication info
A major revision of an IACR publication in EUROCRYPT 2017
DOI
10.1007/978-3-319-56620-7_21
Keywords
Functional Encryptionmulti-inputinner-product
Contact author(s)
rgay @ di ens fr
History
2017-06-01: last of 3 revisions
2016-05-01: received
See all versions
Short URL
https://ia.cr/2016/425
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2016/425,
      author = {Michel Abdalla and Romain Gay and Mariana Raykova and Hoeteck Wee},
      title = {Multi-Input Inner-Product Functional Encryption from Pairings},
      howpublished = {Cryptology {ePrint} Archive, Paper 2016/425},
      year = {2016},
      doi = {10.1007/978-3-319-56620-7_21},
      url = {https://eprint.iacr.org/2016/425}
}
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