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