Group signature has been positive regarded for its wide application, however, dynamic member joining algorithm is complex yet in many of the existing schemes. This paper analyzes the identity-based signature scheme based on quadratic residues proposed by Chai et al and the improvement scheme of literature [ 1 ] , and shows that the improvement scheme is not provable security. This paper also presents a group signature scheme using the scheme proposed by Chai et al and existing converting method. The scheme can effectively solve the dynamic member joining of group signature effectively.%群签名以其广泛的应用受到人们的普遍关注,然而,很多已有方案中群成员的动态加入算法复杂.本文首先分析了柴震川等提出的利用二次剩余构造的基于身份的签名方案和文献[1]的改进方案,指出改进方案不是可证明安全的签名方案,并利用已有的转换方法,将柴震川等提出的签名方案转化为群签名方案,可有效解决群签名中群成员动态加入问题.
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