Security of Wang-Li Threshold Signature Scheme.
Lifeng Guo · 2004
In 2003, Wang et al.[1] proposed a (t, n) threshold signature scheme without a trusted party based on the discrete logarithm problem. In this paper, according to [5]'s attacking method, we show that there are still some security leaks in that scheme, and give some methods of forgery attack. Moreover, we point out this scheme is vulnerable to universal forgery by an insider attacker under reasonable assumptions.