New RSA-based (selectively) convertible undeniable signature schemes
Progress in Cryptology–AFRICACRYPT 2009: Second International Conference on …, 2009•Springer
In this paper, we design and analyze some new and practical (selectively) convertible
undeniable signature (SCUS) schemes in both random oracle and standard model, which
enjoy several merits over existing schemes in the literature. In particular, we design the first
practical RSA-based SCUS schemes secure in the standard model. On the path, we also
introduce two moduli RSA assumptions, including the strong twin RSA assumption, which is
the RSA symmetry of the strong twin Diffie-Hellman assumption (Eurocrypt'08).
undeniable signature (SCUS) schemes in both random oracle and standard model, which
enjoy several merits over existing schemes in the literature. In particular, we design the first
practical RSA-based SCUS schemes secure in the standard model. On the path, we also
introduce two moduli RSA assumptions, including the strong twin RSA assumption, which is
the RSA symmetry of the strong twin Diffie-Hellman assumption (Eurocrypt'08).
Abstract
In this paper, we design and analyze some new and practical (selectively) convertible undeniable signature (SCUS) schemes in both random oracle and standard model, which enjoy several merits over existing schemes in the literature. In particular, we design the first practical RSA-based SCUS schemes secure in the standard model. On the path, we also introduce two moduli RSA assumptions, including the strong twin RSA assumption, which is the RSA symmetry of the strong twin Diffie-Hellman assumption (Eurocrypt ’08).
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