Fully secure functional encryption with general relations from the decisional linear assumption

  • Authors:
  • Tatsuaki Okamoto;Katsuyuki Takashima

  • Affiliations:
  • NTT, Musashino-shi, Tokyo, Japan;Mitsubishi Electric, Kamakura, Kanagawa, Japan

  • Venue:
  • CRYPTO'10 Proceedings of the 30th annual conference on Advances in cryptology
  • Year:
  • 2010

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Abstract

This paper presents a fully secure functional encryption scheme for a wide class of relations, that are specified by nonmonotone access structures combined with inner-product relations. The security is proven under a well-established assumption, the decisional linear (DLIN) assumption, in the standard model. The proposed functional encryption scheme covers, as special cases, (1) key-policy and ciphertext-policy attribute-based encryption with non-monotone access structures, and (2) (hierarchical) predicate encryption with inner-product relations and functional encryption with non-zero inner-product relations.