中文摘要：

介绍了环签名的研究进展情况，对伍前红等人在2004年第八届中国密码学会议上提出的（t，n）环签名方案进行了评述，指出他们所提出的方案具有签名相关性，即可以知道两个环签名是否由同一个（些）成员产生的；同时指出其方案不满足匿名性，未参与产生环签名的成员可以通过一个简化的签名算法证明自己没有制造环签名，也就是揭露了真正签名者的身份。

英文摘要：

This paper introduced the situation and the progress of the research about ring signature. For the （t, n） threshold ring signature scheme proposed by Wu, et al. in Chinacrypt＇ 2004, we pointed out that it does not satisfy the unlinkability, we can learn whether two ring signatures have been issued by the same group member （s）, also it does not satisfy the anonymity, the group member who has not concerned with the ring signature can prove that he did not produce the ring signature via a simple signature, that is, it reveals the real members who have produced ring signature.