And the unrelenting information leakage and network criminal set safety apart . it is an emergency mission for programmer to solve the problem . in this article some research and design upon above is done . the mathematic models of des & rsa are described which are data encryption algorithms with higher safety factor and their strongpoint and shortcoming are compared respectively 本文研究安全系数较高的des和rsa两种数据加密算法的数学模型以及各自的优缺点，并提出了基于以上两种算法复合应用的改进数据加密方法?组合加密方法，分析其可行性以及如何用程序进行改进方案实现。
