一个群签名方案允许每一个群成员代表群匿名进行签名。在发生争议时，群管理员能够追踪一个合法群签名的签名者。本文中，我们用一个新的简单攻击来说明几个群签名方案不具有可追踪性。关键词：群签名，可追踪性Untraceability of Several Group Signature Schemes Yang Yue1，2 Ou Hai-wen 2 (1. College of Communication Engineering, Xidian University, Xi\' an, 710071, China Abstract: A group signature scheme allows every member to sign message on behalf of the group in an anonymous fashion。In case of a dispute, group manager can trace the signer of a valid group signature. In the paper, we show the untraceability of several group signature schemes by new and very simple attack.Key Words: Group Signature, Traceability