A novel ID-based threshold ring signature scheme competent for anonymity and anti-forgery

This study presents an approach to improving the (t, n) ring signature, which permits a signer to sign anonymously. Using fair partitioning to design a new (t, n) threshold ring signature based on bilinear pairing, the study develops a threshold signature method. The proposed method not only permits total signer anonymity, but also resist the signature of an anonymous signer from being forged even in a random oracle mode. Besides, the method is competent for protecting the identity and signature of a signer in regard to the anonymity property of ring signature. Therefore, this method trends suitable for those application complex, such as electronic voting and electronic cash, as well as for democratic management in which members with specific threshold value voice their opinion. © Springer-Verlag Berlin Heidelberg 2007.