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中文摘要：
基于双线性映射与多序列DHE假设，提出了一种基于模糊属性的广播签名算法。在基于模糊属性的签名方案中，对消息签名的属性集S与验证此签名的属性集W必须满足条件｜S∩W｜≥t，t是门限值，在过去的签名方案中，t的值是预先设定不变的；而在文中提出的算法中，门限t值可以根据不同的需要而动态地设定。在计算量方面，设每组最多有m个用户，则验证签名所要计算的双线性对为m＋1个，降低了对用户计算能力的要求。此外本算法可以实现固定大小的密钥及密文，这有利于提高安全传输的性能。
英文摘要：
Proposes a novel efficient broadcast signature algorithm according to fuzzy identities, based on the bilinear maps and multi - sequence of Diffie- Hellman exponents assumption, The fuzzy identity- based signatures, which allow a user with the private key for identity W to verify a message signature signed for identity S if and only if W and S are within a certain distance judged by threshold t. In the former signature schemes, the threshold t is static, but in the algorithm this paper puts forward, the threshold t is dynamic according to different demands. Besides, this algorithm can get constant keys and the ciphertext, which is in favor of promoting the performance of transmission.
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