基于DES加密算法的改进研究  

Research on improvement of DES encryption algorithm

作　　者：张旭 洪家平 ZHANG Xu;HONG Jia-ping(College of Computer and Information Engineering,Hubei Normal University,Huangshi 435000,China)

机构地区：[1]湖北师范大学计算机与信息工程学院,湖北黄石435002

出　　处：《湖北师范大学学报（自然科学版）》2021年第4期55-61,共7页Journal of Hubei Normal University：Natural Science

摘　　要：当代密码技术是在古典密码学的基础上不断发展起来的。为了提升加密算法的安全性,保证关键系统运行的可靠性,密码学技术仍然在不断推陈出新。介绍了DES加密算法的加密原理及其特点,分析了由Wang Yihan和Li Yongzhen所提出的改进DES加密算法,并在此基础上,进一步进行了改进研究,给出了新的优化加密算法。加密算法通过对原加密算法的改进,将64位的密钥扩展到了128位,同时还通过左右两部分的交换通信运算进一步加强了算法的安全性,提高了有效抵抗穷举攻击目的的能力,同时也克服了Wang Yihan和Li Yongzhen提出的改进DES加密算法的不足,且具有对合性。Modern cryptography is constantly developing based on classical cryptography.In order to improve the security of encryption algorithms and ensure the reliability of the operation of key systems,cryptography technology is still constantly innovating.This paper introduces the encryption principle and characteristics of DES encryption algorithm,analyzing the improved DES encryption algorithm proposed by Wang Yihan and Li Yongzhen,and on this basis,research was further improved,a new optimization encryption algorithm was given.The encryption algorithm extends the key from 64 bits to 128 bits by improving the original encryption algorithm.Meanwhile,the security of the new encryption algorithm is further strengthened through the exchange communication between left and right parts,and it increases the ability to effectively resist the purpose of an exhaustive attack.It also overcomes the shortcomings of the improved DES encryption algorithm proposed by Wang Yihan and Li Yongzhen,and it has the property of involution.

关 键 词：加密算法 DES 优化改进 密钥 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]