On the assumption that simultaneous solutions of factoring and discret logarithm are very unlikely,this paper presents the principle and method of a public key cryptosystem,which could be used to improve security.

• 基于若要同时分解因子和计算离散对数几乎是不可能的假设，介绍了构成公开钥密码体制的原理和方法，从而增强了安全性。