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中文摘要：
在实际应用中,门限群签名的门限值往往因签名文件的性质不同而改变,群组中的成员还要根据需要进行添加或删除，常见的门限群签名方案不具有可追踪性、门限值固定和安全性差，该文提出一种多策略门限群签名方案,该方案群成员共享多个群密钥,每个群密钥对应一个门限值,不同群密钥用于签名性质不同的文档,具有可追踪性,可根据需要进行增删群成员,而系统参数只做少量改变,同时该方案可抵抗Tseng的攻击方案。
英文摘要：
Common threshold signature has not traceability, only one threshold value, poor security. In practical application, the threshold value of threshold digital signature depends on the significance of the document. Important document needs more the number of the co-operated users than common document to sign the document. We can solve the problem by using any existing threshold scheme repeatedly,but it isn＇t efficient. The paper proposed a scheme that multi-secret is shared by group member and different group secret has different threshold value to sign different document. Furthermore ,group manager can delete old group member or add new member according requirement.
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