基于群组通信的通用阈值签名和鉴别加密技术分析

Cryptanalysis on generalization of threshold signature and authenticated encryption for group communications

针对Wang等人提出的基于群组通信的通用阈值签名以及鉴别加密技术(W-C-L方案),从两方面证明了该方案的不可靠性:首先,W-C-L不能抵制住他们所声称的方程攻击;其次,W-C-L不是一个真正的门限共享验证。针对最近Tseng等人提出的基于W-C-L的改进算法(T-J-C方案),说明了该方法也会遭受方程攻击。

The generalization of threshold signature and authenticated encryption for group communications (denoted as W-C-L scheme) proposed by Wang et al suffers from two instability. One instability is shown by the failure of W-C-L scheme to withstand equation attack as they claimed. The other is shown by the failure of W-C-L scheme to act as the real threshold shared verification. An improved scheme (denoted as T-J-C scheme) on W-C-L scheme recently proposed by Tseng et al also suffers from equation attack.