A Concealed t-out-of-n Signer Ambiguous Signature Scheme with Variety of Keys

Authors:
Ya-Fen Chang;Chin-Chen Chang;Pei-Yu Lin
Affiliations:
Department of Computer Science and Information Engineering, National Taichung Institute of Technology, Taichung 404, Taiwan, R.O.C., e-mail: cyf@cs.ccu.edu.tw;Dept. of Info. Eng. and Comp. Sci., Feng Chia Univ., Taichung 40724, Taiwan, R.O.C., e-mail: ccc@cs.ccu.edu.tw and Dept. of Comp. Sci. and Info. Eng., National Chung Cheng Univ., Chiayi 621, Taiwa ...;Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi 621, Taiwan, R.O.C., e-mail: lpy91@cs.ccu.edu.tw
Venue:
Informatica
Year:
2007

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Adaptively Secure Threshold Signature Scheme in the Standard Model

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Abstract

In 2004, Abe et al. proposed a threshold signer-ambiguous signature scheme from variety of keys. Their scheme is a generalized case of the ring signature scheme, and it allows the key types to be based on the trapdoor one-way permutations (TOWP) or sigma-protocols including Schnorr's signature scheme. However, the signed message is public for all, which may result in disputes. In this paper, we present a novel threshold signer-ambiguous signature scheme, having the signed message concealed and keeping who the receivers are secret from variety of keys.