中文摘要：

在密码体制中,密钥的安全性决定着整个系统的安全性.为了减轻群签名中密钥 泄露带来的损失,文章将密钥隔离技术同群签名方案相结合,提出-种密钥隔离的群签名方案.方案不但满足群签名的匿名性、可跟踪性等安全性能,还大大降低了密钥泄露带来的危害.密 钥隔离技术使得当前时间段的密钥泄露不会影响其之前和之后阶段的签名,且支持并行的消息 更新.单个协助器的密钥泄露不会对协助器的初始密钥造成危害,保证了签名的安全性.文章 方案基于CDH难解问题,在随机预言模型下可证安全性.

英文摘要：

In the cryptographic system, the security of the key determines the security of the whole system. In order to reduce the loss of key disclosure in group signature, this paper proposes a key-isolated group signature scheme by combining the technology of key isolation with group signature. The scheme not only satisfies the security properties of group signature, such as anonymity and traceability, but also greatly reduces the harm caused by key disclosure. Key isolation technology makes the key disclosure on the current time period does not affect the signature before and after the current time period, and supports parallel message updating. The key disclosure of a single helper does not harm the initial key of the helper, thus ensuring the security of the signature. The Scheme is based on the CDH difficult problem, and the security can be proved under the random oracle model.