From Selective to Full Security: Semi-generic Transformations in the Standard Model

  • Michel Abdalla
  • Dario Fiore
  • Vadim Lyubashevsky
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7293)

Abstract

In this paper, we propose an efficient, standard model, semigeneric transformation of selective-secure (Hierarchical) Identity-Based Encryption schemes into fully secure ones. The main step is a procedure that uses admissible hash functions (whose existence is implied by collision-resistant hash functions) to convert any selective-secure wildcarded identity-based encryption (WIBE) scheme into a fully secure (H)IBE scheme. Since building a selective-secureWIBE, especially with a selective-secure HIBE already in hand, is usually much less involved than directly building a fully secure HIBE, this transform already significantly simplifies the latter task. This black-box transformation easily extends to schemes secure in the Continual Memory Leakage (CML) model of Brakerski et al. (FOCS 2010), which allows us obtain a new fully secure IBE in that model. We furthermore show that if a selective-secure HIBE scheme satisfies a particular security notion, then it can be generically transformed into a selective-secure WIBE. We demonstrate that several current schemes already fit this new definition, while some others that do not obviously satisfy it can still be easily modified into a selective-secure WIBE.

Keywords

Random Oracle Correlate Randomness Identity Space Challenge Ciphertext Challenge Identity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© International Association for Cryptologic Research 2012

Authors and Affiliations

  • Michel Abdalla
    • 1
  • Dario Fiore
    • 2
  • Vadim Lyubashevsky
    • 1
  1. 1.Département d’InformatiqueÉcole normale supérieureFrance
  2. 2.Department of Computer ScienceNew York UniversityUSA

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