Vanesa Daza Javier Herranz Paz Morillo Carla Ràfols Ad-Hoc Threshold Broadcast Encryption with Shorter Ciphertexts. 3-15 2008 192 Electr. Notes Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/j.entcs.2008.05.002 db/journals/entcs/entcs192.html#DazaHMR08