一种安全的分布式群签名方案

摘要

A distributed group signature scheme was proposed using a standard model, and its correctness and security 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 manager 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 single-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 availability of the group signature.%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.