A Novel Unidirectional Proxy Re-Signature Scheme and Its Application for MANETs

Mobile ad-hoc networks (MANETs) have received a lot of attention recently, adapting proxy re-signature to work in such environments is challenging. In this paper, we propose a novel and efficient proxy re-signature scheme, which provides a flexible and secure way for authorizing the new nodes of mobile ad-hoc networks. The proposed scheme is unidirectional, single-use and non-transitive. Compared with the previous schemes, we need only a few public parameters and no pairing operation in signature and re-signature algorithms. We will also give the concrete security analysis of the proposed scheme. Its security is based on the Computational Diffie-Hellman assumption in the random oracle model. Thus, the scheme is suitable for the mobile ad-hoc networks, for it is completely non-interactive and is very simple.