Abstract
摘要: 广义签密是指除了能实现签密功能，还可单独实现加密和认证功能的密码机制。该文定义了不同PKG环境下基于身份的广义签密方案较为全面的安全模型，并提出一个具体方案，进而在标准模型下证明了方案的安全性。和已有的不同PKG环境下基于身份签密方案相比，文中方案的效率较高，且应用范围更为广泛。 关键词: 基于身份密码 / 广义签密 / 不同PKG环境 / 双线性对 / 标准模型
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