Identity Based Group Signatures from Hierarchical Identity-Based Encryption

  • Authors:
  • Nigel P. Smart;Bogdan Warinschi

  • Affiliations:
  • Dept. Computer Science, University of Bristol, Bristol, United Kingdom BS8 1UB;Dept. Computer Science, University of Bristol, Bristol, United Kingdom BS8 1UB

  • Venue:
  • Pairing '09 Proceedings of the 3rd International Conference Palo Alto on Pairing-Based Cryptography
  • Year:
  • 2009

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Abstract

A number of previous papers explored the notion of identity-based group signature. We present a generic construction of identity-based group signatures. Our construction is based on the Naor transformation of a identity-based signature out of an identity-based encryption, adjusted to hierarchical identity-based encryption. We identify sufficient conditions on the underlying HIBE so that the scheme that results from our transformation meets our security definitions. Finally, we suggest a couple of extensions enabled by our construction, one of which is to hierarchical identity-based group signatures.