Efficient and provably-secure identity-based signatures and signcryption from bilinear maps

  • Authors:
  • Paulo S. L. M. Barreto;Benoît Libert;Noel McCullagh;Jean-Jacques Quisquater

  • Affiliations:
  • PCS, Escola Politécnica, Universidade de São Paulo, São Paulo(SP), Brazil;Microelectronics Laboratory, Crypto Group, UCL, Louvain-La-Neuve, Belgium;School of Computer Applications, Dublin City University, Ballymun, Dublin 9, Ireland;Microelectronics Laboratory, Crypto Group, UCL, Louvain-La-Neuve, Belgium

  • Venue:
  • ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
  • Year:
  • 2005

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Abstract

In this paper we describe a new identity-based signcryption (IBSC) scheme built upon bilinear maps. This scheme turns out to be more efficient than all others proposed so far. We prove its security in a formal model under recently studied computational assumptions and in the random oracle model. As a result of independent interest, we propose a new provably secure identity-based signature (IBS) scheme that is also faster than all known pairing-based IBS methods.