Miodrag J. Mihaljevic Marc P. C. Fossorier Hideki Imai Security evaluation of certain broadcast encryption schemes employing a generalized time-memory-data trade-off. 988-990 2007 11 IEEE Communications Letters 12 http://dx.doi.org/10.1109/LCOMM.2007.071029 db/journals/icl/icl11.html#MihaljevicFI07