A Generic Variant of NIST’s KAS2 Key Agreement Protocol

  • Sanjit Chatterjee
  • Alfred Menezes
  • Berkant Ustaoglu
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6812)

Abstract

We propose a generic three-pass key agreement protocol that is based on a certain kind of trapdoor one-way function family. When specialized to the RSA setting, the generic protocol yields the so-called KAS2 scheme that has recently been standardized by NIST. On the other hand, when specialized to the discrete log setting, we obtain a new protocol which we call DH2. An interesting feature of DH2 is that parties can use different groups (e.g., different elliptic curves). The generic protocol also has a hybrid implementation, where one party has an RSA key pair and the other party has a discrete log key pair. The security of KAS2 and DH2 is analyzed in an appropriate modification of the extended Canetti-Krawczyk security model.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Sanjit Chatterjee
    • 1
  • Alfred Menezes
    • 2
  • Berkant Ustaoglu
    • 3
  1. 1.Indian Institute of ScienceIndia
  2. 2.University of WaterlooCanada
  3. 3.Sabanci UniversityTurkey

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