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›› 2013, Vol. 30 ›› Issue (2): 264-271.DOI: 10.7523/j.issn.1002-1175.2013.02.019

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Statistically binding non-interactive non-mallebale commitment

HUANG Gui-Fang, HU Lei   

  1. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100195, China
  • Received:2011-11-15 Revised:2012-04-18 Online:2013-03-15
  • Supported by:

    Supported by National Key Basic Research Program of China (2013CB834203), NSFC(61070172, 61003276, and 10990011), and the Strategic Priority Research Program of Chinese Academy of Sciences(XDA06010702 Corresponding author, E-mail:

Abstract:

In STOC 2003, based on the existence of one-way function, a non-interactive and reusable statistically binding non-malleable commitment in the common reference string (CRS) model was proposed. There the CRS contains four parts: a public key to a commitment, a public key to a signature scheme, a universal one-way hash function, and a commitment to string 0. In this paper, we use two signature schemes to construct such a scheme. Here the CRS has only two parts: a public parameter of an equivocable commitment and a public key to a signature scheme. Therefore, the new scheme has a much shorter CRS.

Key words: commitment, non-malleability with respect to decommitment, ∑-protocol, signature

CLC Number: