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New Approach for Selectively Convertible Undeniable Signature Schemes

By Kaoru Kurosawa and Tsuyoshi Takagi


Abstract. In this paper, we propose a new approach for constructing selectively convertible undeniable signature schemes, and present two efficient schemes based on RSA. Our approach allows a more direct selective conversion than the previous schemes, and the security can be proved formally. Further, our disavowal protocols do not require parallelization techniques to reach a significant soundness probability. Also, our second scheme is the first selectively convertible scheme which is provably secure without random oracles

Topics: selective conversion, RSA
Year: 2006
OAI identifier: oai:CiteSeerX.psu:
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