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INFORMATICALT
2007

Analysis and Improvements of Two Identity-Based Perfect Concurrent Signature Schemes

9 years 11 months ago
Analysis and Improvements of Two Identity-Based Perfect Concurrent Signature Schemes
The notion of concurrent signatures was introduced by Chen, Kudla and Paterson in their seminal paper in Eurocrypt 2004. In concurrent signature schemes, two entities can produce two signatures that are not binding, until an extra piece of information (namely the keystone) is released by one of the parties. Upon release of the keystone, both signatures become binding to their true signers concurrently. In ICICS 2005, two identity-based perfect concurrent signature schemes were proposed by Chow and Susilo. In this paper, we show that these two schemes are unfair, in which the initial signer can cheat the matching signer. We present a formal definition of ID-based concurrent signatures which redress the flaw of Chow et al.’s definition and then propose two simple but significant improvements to fix our attacks.
Zhenjie Huang, Kefei Chen, Xuanzhi Lin, Rufen Huan
Added 15 Dec 2010
Updated 15 Dec 2010
Type Journal
Year 2007
Where INFORMATICALT
Authors Zhenjie Huang, Kefei Chen, Xuanzhi Lin, Rufen Huang
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