标准模型下多个PKG的基于身份广义签密

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。

Identity Based Generalized Signcryption Scheme for Multiple PKGs in Standard Model

Generalized signcryption is a cryptographic primitive which could not only realize signcryption but also provide encryption and authentication alone. In this paper, the formal definition and a complete security notion of identity based generalized signcryption for multiple PKGs is defined. A concrete scheme is also proposed with security proof in standard model. Compared with several existing identity based signcryption schemes for multiple PKGs, the new scheme is more efficient and flexible.