Predicate- and attribute-hiding inner product encryption in a public key setting

Yutaka Kawai, Katsuyuki Takashima

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)

Abstract

In this paper, we propose a reasonable definition of predicate-hiding inner product encryption (IPE) in a public key setting, which we call inner product encryption with ciphertext conversion (IPE-CC), where original ciphertexts are converted to predicate-searchable ones by an helper in possession of a conversion key. We then define a notion of full security for IPE-CC, which comprises three security properties of being adaptively predicate- and attribute-hiding in the public key setting, adaptively (fully-)attribute-hiding against the helper, and usefully secure even against the private-key generator (PKG). We then present the first fully secure IPE-CC scheme, and convert it into the first fully secure symmetric-key IPE (SIPE) scheme, where the security is defined in the sense of Shen, Shi, Waters. All the security properties are proven under the decisional linear assumption in the standard model. The IPE-CC scheme is comparably as efficient as existing attribute-hiding (not predicate-hiding) IPE schemes. We also present a variant of the proposed IPE-CC scheme with the same security that achieves shorter public and secret keys. We employ two key techniques, trapdoor basis setup, in which a new trapdoor is embedded in a public key, and multi-system proof technique, which further generalizes an extended dual system approach given by Okamoto and Takashima recently.

Original languageEnglish
Pages (from-to)113-130
Number of pages18
JournalLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume8365 LNCS
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event6th International Conference on Pairing-Based Cryptography, Pairing 2013 - Beijing, China
Duration: 2013 Nov 222013 Nov 24

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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