Ginger Perng Michael K. Reiter Chenxi Wang M2: Multicasting Mixes for Efficient and Anonymous Communication. 59 2006 conf/icdcs/2006 ICDCS http://doi.ieeecomputersociety.org/10.1109/ICDCS.2006.53 db/conf/icdcs/icdcs2006.html#PerngRW06