An Unbalanced Protocol for Group Key Exchange

• Javier Herranz Sotoca ^[1] ; Jorge L. Villar Santos ^[1]
  1. [1] Universitat Politècnica de Catalunya

     Universitat Politècnica de Catalunya

     Barcelona, España

     
• Localización: Trust and Privacy in Digital Business: First International Conference,TrustBus 2004 Zaragoza, Spain, August 30 - September 1, 2004 Proceedings / coord. por Sokratis Katsikas, Günther Pernul, Javier López, 2004, ISBN 3540229191, págs. 172-180
• Idioma: inglés
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• Resumen

  • In a group key exchange protocol, a group of players must compute a common secret key by using only public channels. There are many proposed protocols for group key exchange, and all of them are balanced or symmetric: all the players must perform the same amount of computation in the protocol.

    We propose an unbalanced group key exchange scheme: two of the players perform most of the computations of the protocol. This scheme can be useful in situations where players do not all have the same computational and communication resources. The security of the protocol is based on the Decisional Diffie-Hellman Assumption