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 | Department of Information Engineering and Computer Science, Feng Chia University, Taichung 40724, Taiwan, R.O.C., e-mail: ccc@cs.ccu.edu.tw | Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi 621, Taiwan, R.O.C., e-mail: lpy91@cs.ccu.edu.tw
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.
Keywords: trapdoor one-way permutation, digital signature, signer-ambiguous signature, ring signature, Schnorr's signature scheme
Journal: Informatica, vol. 18, no. 4, pp. 535-546, 2007
