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. 213-230 2008 407 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2008.05.021 db/journals/tcs/tcs407.html#SantisFM08