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Key exposure free chameleon hash schemes based on discrete logarithm problem

Title
Key exposure free chameleon hash schemes based on discrete logarithm problem
Authors
Lim S.Lee J.An Y.
Ewha Authors
임선간
SCOPUS Author ID
임선간scopusscopus
Issue Date
2013
Journal Title
Security and Communication Networks
ISSN
1939-0122JCR Link
Citation
vol. 6, no. 7, pp. 812 - 817
Indexed
SCIE; SCOPUS WOS scopus
Abstract
A chameleon hash scheme is a trapdoor collision-resistant hash scheme, and it provides many interesting features in signature schemes with hash-and-sign construction. In this paper, we introduce the notion of key exposure threshold τ for a chameleon hash scheme for which a key exposure free chameleon hash scheme can be understood as the case with τ=∞. We propose chameleon hash schemesCHτ with the key exposure threshold τ based on discrete logarithm problem (DLP). For τ<∞, the proposed scheme is noninteractive and key exposure free as long as k ephemeral trapdoors are disclosed for k<τ. The proposed schemeCH∞ is a key exposure free chameleon hash scheme based on DLP, and it requires a label directory that can be managed by a third party. This improves the only known efficient key exposure free chameleon hash scheme based on DLP, which requires one interaction with the trapdoor holder. © 2012 John Wiley & Sons, Ltd..
DOI
10.1002/sec.612
Appears in Collections:
연구기관 > 수리과학연구소 > Journal papers
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