数据加密标准(DES)算法是典型的分组对称式私钥密码机制，在加密学研究领域中占据着十分重要的地位，且对于以融合网络和物联网为代表的下一代网络中各类嵌入式加密应用而言具有很好的适用性。本文简单介绍了 DES算法原理及其安全性，主要针对 DES算法易受穷举攻击法的不足，依据 DES 算法本身的特点提出了改进措施，采用双密钥交叉加密，提高加密过程中密钥的复杂度，增强抵抗攻击的能力，达到对 DES算法安全性的改善。%Data Encryption Standard(DES) algorithm is a typical private password mechanism,and its group is symmetric. The algorithm is very important in the field of encryption study. It is adaptive to the applications for encryption in many different systems, especially in the embedded system of Internet of Things(IOT) and Convergence Networks in the next generation. This article simply introduces the principle and the safety of DES algorithm. According to the characteristics of the DES algorithm,an improved scheme is put forward in order to overcome its easily attacked shortcomings. This method adopts two keys to crosswise encrypt. It can improve the complexity of encryption key in the process and enhance the ability of resisting attack, therefore, the safety of DES algorithm is improved.
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