标准模型下可证安全的动态短群签名方案

目前的群签名方案在性能及安全性方面均不同程度存在问题，因此基于BSZ群签名模型提出了一种在标准模型下可证安全性的动态短群签名方案.利用子群判定假设、l-SDH假设以及Groth-Sahai证明系统构建了该方案，并在标准模型下给出了验证的安全性证明，证明提出的群签名方案具有匿名性、可追踪性和不可诬陷性.最后，分别在安全性及性能两个方面与其他群签名方案进行了比较，结果表明提出的群签名方案要优于其他方案.

Dynamic Short Group Signatures with Provable Security in Standard Model

The existing group signature schemes are unpractical to a certain extent in performance and security. A dynamic short group signature scheme with provable security in a standard model is thus proposed on the basis of the BSZ model. The subgroup decision assumptions (SDA)， l SDH assumptions and Groth Sahai proof system are used to construct the scheme with security proved in the standard model. It is shown that the as proposed scheme meets anonymity， traceability and non frameability. It is compared with other group signature schemes in performance and security， and the results show that our scheme outperforms those in these two aspects.