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Identity-Based Parallel Key-Insulated Encryption Without Random Oracles: Security Notions and Construction

  • Jian Weng
  • Shengli Liu
  • Kefei Chen
  • Changshe Ma
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4329)

Abstract

In this paper, we apply the parallel key-insulation mechanism to identity-based encryption (IBE) scenarios, and minimize the damage caused by key-exposure in IBE systems. We first formalize the definition and security notions for ID-based parallel key-insulated encryption (IBPKIE) systems, and then propose an IBPKIE scheme based on Water’s IBE scheme. To the best of our knowledge, this is the first IBPKIE scheme up to now. Our scheme enjoys two attractive features: (i) it is provably secure without random oracles; (ii) it not only allows frequent key updating, but also does not increase the risk of helper key-exposure.

Keywords

Parallel Key-Insulation Identity-Based Encryption Key-Exposure Bilinear Pairings 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Jian Weng
    • 1
  • Shengli Liu
    • 1
    • 2
  • Kefei Chen
    • 1
  • Changshe Ma
    • 3
  1. 1.Dept. of Computer Science and EngineeringShanghai Jiao Tong UniversityShanghaiP.R. China
  2. 2.Key Laboratory of CNISXidian UniversityXianP.R. China
  3. 3.School of ComputerSouth China Normal University ShipaiGuangzhouP.R. China

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