基于组合公钥的IBE算法

为提高基于身份加密(IBE)算法的安全性，设计一种基于组合公钥(CPK)的IBE算法。按照CPK中用户密钥生成方法生成用户公钥，实现身份到椭圆曲线点群的映射，利用系统主密钥矩阵代替单个系统主密钥，扩展系统主密钥空间，从而降低单个系统主密钥泄露导致系统被攻破的风险。理论分析表明，该算法具有大规模密钥管理与公钥认证简单的优势，且不存在共谋攻击。

Identity-Based Encryption Algorithm Based on CPK

In order to improve the security of Identity-Based Encryption（IBE） algorithm,this paper designs IBE algorithm based on Combined Public Key（CPK）.It produces user public key according to the method of user key producing in CPK,realizes the map from identity to the group of points on an elliptic curve simply,replaces single system master key with system master key matrix,and expands the space of system master key and reduces the risk that the system is destroyed for the leak of the single system master key.Theory analysis results show that this algorithm has the characteristics of large scale key management,simple public key authentication,and it does not have the collusion attack.