Construction of Threshold Public-Key Encryptions through Tag-Based Encryptions

  • Seiko Arita
  • Koji Tsurudome
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5536)

Abstract

In this paper, we propose a notion of threshold tag-based encryption schemes that simplifies the notion of threshold identity-based encryption schemes, and we show a conversion from any stag-CCA-secure threshold tag-based encryption schemes to CCA-secure threshold public-key encryption schemes. Moreover, we give two concrete constructions of stag-CCA-secure threshold tag-based encryption schemes, under the decisional bilinear Diffie-Hellman assumption and the decisional linear assumption, respectively. Thus, we obtain two concrete constructions of threshold public-key encryption schemes, both of which are non-interactive, robust and can be proved secure without random oracle model. Our threshold public-key encryption schemes are conceptually more simple and shown to be more efficient than those of Boneh, Boyen and Halevi.

Keywords

threshold public-key encryption schemes tag-based encryption schemes the decisional bilinear Diffie-Hellman assumption the decisional linear assumption 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Seiko Arita
    • 1
  • Koji Tsurudome
    • 1
  1. 1.Institute of Information SecurityYokohamaJapan

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