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New Construction of Short Hierarchical ID-Based Signature in the Standard Model

Zhang L., Hu Y., Wu Q

Fundamenta Informaticae

2009

Vol. 90, nr 1-2

191-201

In this paper, a new construction of hierarchical ID-Based signature (HIBS) scheme is proposed. The new scheme has some advantages over the available schemes: the private keys size shrinks as the identity depth increases and the signature size is a constant as it consists of three group elements. Furthermore, under the h-CDH assumption, our scheme is provably secure in the standard model. This assumption is more natural than many of the hardness assumptions recently introduced to HIBS in the standard model.