A New Construction of Short Hierarchical Identity-based Signature in the Standard Model

摘要

In this paper, a new short hierarchical identity-based signature (HIBS) scheme is proposed in the standard model. This scheme has some advantages over the available schemes: the private keys size shrinks as the identity depth increases and the signature size is constant as it consists of three group elements. Furthermore, under the generalization selective-identity security model, we reduce the security of the new scheme to the h-Exponent Computational Diffie-Hellman (h-CDH) assumption. This assumption is more natural than many of the hardness assumptions recently introduced to HIBS in the standard model.