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Proxy Re-signature Schemes Without Random Oracles

  • Jun Shao
  • Zhenfu Cao
  • Licheng Wang
  • Xiaohui Liang
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4859)

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. [6] at EUROCRYPT 1998, and the others are proposed by Ateniese and Hohenberger [2] at 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 [20], 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.

Keywords

proxy re-signature standard model ID-based bilinear maps existential unforgeability 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Jun Shao
    • 1
  • Zhenfu Cao
    • 1
  • Licheng Wang
    • 1
  • Xiaohui Liang
    • 1
  1. 1.Department of Computer Science and Engineering, Shanghai Jiao Tong University, 200240, ShanghaiP.R. China

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