中文摘要：

在标准模型下提出了一种分布式群签名方案,并分析了方案的正确性和安全性.分析结果表明,合法的群成员可以代表群生成有效的群签名,仲裁者可以打开签名,且可以判断群管理者是否伪装成合法的群成员.同时,该方案利用分布式协助器辅助每个时间段群成员密钥的升级,不但实现了该签名的前向安全和后向安全性,而且避免了协助器单点失效所带来的群成员无法升级的后果,从而在抵抗群成员私钥泄露的基础上,增强了群签名方案的健壮性和可用性.

英文摘要：

A distributed group signature scheme was proposed using a standard model, and its correctness and secu- rity was also analyzed. The analysis shows that a legal group member can generate a group signature on behalf of the group, and an arbiter can open a legal signature while also having the ability to determine whether the group man- ager is disguised as a legitimate group member. Furthermore, this scheme takes advantage of distributed helpers to help update member keys in every time section, thus forward and backward security is implemented, and the sin- gle-point failure of a helper which would cause a group member to not be able to update is avoided. Therefore, the scheme proposed can not only resist disclosure of group member keys, but also enhance the robustness and availa- bility of the group signature.