New Anonymity Notions for Identity-Based Encryption

  • Authors:
  • Malika Izabachène;David Pointcheval

  • Affiliations:
  • Ecole Normale Supérieure --- LIENS/CNRS/INRIA, France;Ecole Normale Supérieure --- LIENS/CNRS/INRIA, France

  • Venue:
  • SCN '08 Proceedings of the 6th international conference on Security and Cryptography for Networks
  • Year:
  • 2008

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Abstract

Identity-based encryption is a very convenient tool to avoid key management. Recipient-privacy is also a major concern nowadays. To combine both, anonymous identity-based encryption has been proposed. This paper extends this notion to stronger adversaries (the authority itself). We discuss this new notion, together with a new kind of non-malleability with respect to the identity, for several existing schemes. Interestingly enough, such a new anonymity property has an independent application to password-authenticated key exchange. We thus come up with a new generic framework for password-authenticated key exchange, and a concrete construction based on pairings.