Raghav Bhaskar Paul Mühlethaler Daniel Augot Cedric Adjih Saadi Boudjit Anis Laouiti Efficient and Dynamic Group Key Agreement in Ad hoc Networks http://arxiv.org/abs/cs/0611027 2006 CoRR abs/cs/0611027 db/journals/corr/corr0611.html#abs-cs-0611027 informal publication