An Improved (t,n)Threshold Signature Scheme Without Trusted Party
Yu Fen Zhou · Journal of Chinese Computer Systems · 2007
In 1995, Li C, Hwang T, Lee N proposed two threshold signature schemes: one with Trusted Party and the other without Trusted Party.This paper will discuss the second scheme (name as LHL threshold signature scheme or LHL scheme). Wang Gui-lin pointed out two security limits of LHL threshold group signature scheme:the existence of signature forgery attack and the failure to possess anonymity and traceability at the same time.This paper proposes an improved scheme base on LHL scheme.The improved scheme can prevent cheating behaviors of the people who shared system secrets.The scheme has the features including verification, anonymity and traceability at the same time.So the new scheme is more secure than the old scheme.