New constructions for provably-secure time-bound hierarchical key assignment schemes.

Alfredo De Santis Anna Lisa Ferrara Barbara Masucci New constructions for provably-secure time-bound hierarchical key assignment schemes. 133-138 2007 conf/sacmat/2007 SACMAT http://doi.acm.org/10.1145/1266840.1266861 db/conf/sacmat/sacmat2007.html#SantisFM07