A security drawback and its improvement of a group signature scheme
Yuan Ding · Journal of the China Railway Society · 2003
Recently, Lee and Chang have proposed an efficient group signature scheme based on discrete logarithm problem. However, their scheme can not resist forgery attack and is not unlinkable. Ao Qingyun et al presented an improved scheme to overcome the drawback of Lee and Chang scheme. In this paper, it is pointed out at first that the group signature scheme proposed by Ao Qingyun et al is insecure, and an improved scheme based on Tseng's scheme has proposed, and a simple security analysis is put forward also.