Nuttapong Attrapadung Hideki Imai Practical Broadcast Encryption from Graph-Theoretic Techniques and Subset-Incremental-Chain Structure. 187-203 2007 90-A IEICE Transactions 1 http://dx.doi.org/10.1093/ietfec/e90-a.1.187 db/journals/ieicet/ieicet90a.html#AttrapadungI07