Frederik Armknecht Joao Girão Alfredo Matos Rui L. Aguiar Who Said That? Privacy at Link Layer. 2521-2525 2007 conf/infocom/2007 INFOCOM http://dx.doi.org/10.1109/INFCOM.2007.313 db/conf/infocom/infocom2007.html#ArmknechtGMA07