Abstract
We construct an efficient non-generic private-key functional encryption (FE) for inner-product values with full-hiding security, where confidentiality is assured not only for encrypted data but also for functions associated with secret keys. Recently, Datta et al. presented such a scheme in PKC 2016 and this is the only scheme that achieved full-hiding security. Our scheme has an advantage over their scheme for the following points.
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1.
More efficient: our scheme is two times faster in encryption and decryption, and a master secret key, secret keys and ciphertexts are the half size, compared with their scheme.
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2.
Weaker assumption: our scheme is secure under the decisional linear (DLIN) assumption or its variant, while their scheme is under a stronger assumption, the symmetric external Diffie-Hellman (SXDH) assumption.
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3.
More flexible: we can apply our scheme to any type of bilinear pairing groups, while their scheme is suitable only for type 3 groups.
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Tomida, J., Abe, M., Okamoto, T. (2016). Efficient Functional Encryption for Inner-Product Values with Full-Hiding Security. In: Bishop, M., Nascimento, A. (eds) Information Security. ISC 2016. Lecture Notes in Computer Science(), vol 9866. Springer, Cham. https://doi.org/10.1007/978-3-319-45871-7_24
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