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Universally Composable Blind Signature Functionality

Author

Listed:
  • 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)

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.

Suggested Citation

  • Shirley H. C. Cheung & C. H. Lee & Yunlei Zhao, 2004. "Universally Composable Blind Signature Functionality," International Journal of Information Technology & Decision Making (IJITDM), World Scientific Publishing Co. Pte. Ltd., vol. 3(04), pages 673-684.
    • Handle: RePEc:wsi:ijitdm:v:03:y:2004:i:04:n:s0219622004001318
    DOI: 10.1142/S0219622004001318
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