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2000年，Popescu C提出了一个Tseng-Jan群签名方案的修改方案。该文对该方案作了分析，指出该方案优越于Tseng-Jan方案，签名内容泄露不了任何有关秘密参数的信息，但它仍存在漏洞：(1)群成员可以单独构造密钥对；(2)群成员可以联合构造密钥对。从而伪造有效的群签名，因此该方案是不安全的。
In 2000, Popescu C proposed a modification of the Tseng-Jan group signature scheme. The paper analyzes the scheme and points out that the scheme is superior to the Tseng-Jan scheme. The signature content can not reveal any information about the secret parameters, but there are still some loopholes: (1) the group members can construct the key pair separately; (2) ) Group members can jointly construct a key pair. Thus forging an effective group signature, the program is not safe.