UNIVERSALLY COMPOSABLE BLIND SIGNATURE FUNCTIONALITY

Shirley H. C. Cheung (), C. H. Lee () and Yunlei Zhao ()
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Shirley H. C. Cheung: Department of Computer Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, China
C. H. Lee: Department of Computer Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, China
Yunlei Zhao: Department of Computer Science, Fudan University, Shanghai 200433, P. R. China

International Journal of Information Technology & Decision Making (IJITDM), 2004, vol. 03, issue 04, 673-684

Abstract: Blind signatures play a critical role in digital cash systems. In this paper, we investigate the blind signature functionality in the framework of universally composable (UC) security — the strongest security guarantees up to now for cryptographic protocols over the Internet. We present the universally composable blind signature functionality,$\mathcal{F}_{\tt{BSIG}}$. Our approach is based on a new UC signature functionality$\mathcal{F}_{\tt{MSIG}}$, which is a modified version of the original signature functionality$\mathcal{F}_{\tt{SIG}}$presented by Canetti. We also prove that$\mathcal{F}_{\tt{MSIG}}$and$\mathcal{F}_{\tt{SIG}}$are actually equivalent with respect to non-adaptive adversaries. Our result is of both theoretical and practical consequence to future research studies and practical implementations of digital cash systems with universally composable security.

Keywords: Digial cash; blind signatures; universally composable security (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0219622004001318

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