An active attack on a distributed Group Key Exchange system
  In this work, we introduce an active attack on a Group Key Exchange protocol by Burmester and Desmedt. The attacker obtains a copy of the shared key, which is created in a collaborative manner with the legal users in a communication group. 
Mohamed Baouch, Juan Antonio L\'opez-Ramos, Reto Schnyder, Blas   Torrecillas
cs.CR