Topics in Cryptology – CT-RSA 2005

Volume 3376 of the series Lecture Notes in Computer Science pp 262-274

A New Two-Party Identity-Based Authenticated Key Agreement

  • Noel McCullaghAffiliated withSchool of Computing, Dublin City University
  • , Paulo S. L. M. BarretoAffiliated withEscola Politécnica, Universidade de São Paulo

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We present a new two-party identity-based key agreement that is more efficient than previously proposed schemes. It is inspired on a new identity-based key pair derivation algorithm first proposed by Sakai and Kasahara. We show how this key agreement can be used in either escrowed or escrowless mode. We also describe conditions under which users of different Key Generation Centres can agree on a shared secret key. We give an overview of existing two-party key agreement protocols, and compare our new scheme with existing ones in terms of computational cost and storage requirements.


authenticated key agreement identity-based cryptography bilinear maps Tate pairing