摘要：In this work, we present a new anonymous HIBE scheme which is unbounded in the sense that the public parameters do not impose additional limitations on the functionality of the systems. In most of previous constructions of anonymous HIBE in the standard model, a maximum hierarchy depth had to be fixed at setup. Our constructions avoid these limitations. We use a nested dual system encryption argument to prove full security for our anonymous HIBE scheme, in the standard model and relying on static assumptions.
