Welcome to the resource topic for 2007/396
Title:
Proxy Re-Signature Schemes without Random Oracles
Authors: Jun Shao, Zhenfu Cao, Licheng Wang, Xiaohui Liang
Abstract:To construct a suitable and secure proxy re-signature scheme is not an easy job, up to now, there exist only three schemes, one is proposed by Blaze et al. at EUROCRYPT 1998, and the others are proposed by Ateniese and Hohenbergerat ACM CCS 2005. However, none of these schemes is proved in the standard model (i.e., do not rely on the random oracle heuristic). In this paper, based on Waters’ approach, we first propose a multi-use bidirectional proxy re-signature scheme, denoted as S_{mb}, which is existentially unforgeable in the standard model. And then, we extend S_{mb} to be a multi-use bidirectional ID-based proxy re-signature scheme, denoted by S_{id-mb}, which is also existentially unforgeable in the standard model. Both of these two proposed schemes are computationally efficient, and their security bases on the Computational Diffie-Hellman (CDH) assumption.
ePrint: https://eprint.iacr.org/2007/396
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