Security

Password-Authenticated Constant-Round Group Key Establishment With a Common Reference String

Download Now Free registration required

Executive Summary

A provably secure password-authenticated protocol for group key establishment in the Common Reference String (CRS) model is presented. The construction assumes the participating users to share a common password and combines projective hashing as introduced by Cramer and Shoup with a construction of Burmester and Desmedt. The protocol is constant-round. Namely, it is a three-round protocol that can be seen as generalization of a two-party proposal of Gennaro and Lindell. In distributed applications, low-entropy passwords are still a dominating tool for authentication. Reflecting this, significant research efforts are currently devoted to the exploration of password-authenticated key establishment protocols.

  • Format: PDF
  • Size: 284 KB