一种基于身份的广义签密方案

An Identity-based Generalized Signcryption Scheme

为了解决安全性需求不确定网络环境的安全性问题,广义签密方案被提出,其具有灵活多变的特点,能在一个密码模块内实现签密、加密和签名三种功能。以提高计算效率和实现更高的安全性为目标,研究分析了以往高效安全的广义签密方案,给出了一种新的基于身份广义签密方案。从各方面对该方案进行了安全性的证明与分析,并将该方案与目前计算效率较高的广义签密方案进行了比较,还给出了一个该方案的应用实例,描述了该方案在邮件系统中的具体运用过程。结果表明,新方案的椭圆曲线点乘运算、双线性对运算的次数都有所降低。

For meeting the requirements of security in unstable network environment,genaralized signcryption is proposed. It has flexible features,and can achieve signcryption,encryption and signature within one cryptographic module. In order to improve the computational efficiency and security, analysis of the proposed schemes, a new identity-based generalized signcryption program is put forward. The security of this scheme is proved from all aspects,then it is in contrast with the proposed schemes which has high computational efficiency. An application example of the scheme is given and the process of applying the program is described in mail system. The results show that the new scheme reduces the numbers of computation of the pairing and scalar multiplication.