计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (9): 92-94.DOI: 10.3778/j.issn.1002-8331.2009.09.026

• 网络、通信、安全 • 上一篇    下一篇

基于前缀码的DES算法改进研究

谢志强1,高鹏飞1,杨 静2   

  1. 1.哈尔滨理工大学 计算机科学与技术系,哈尔滨 150080
    2.哈尔滨工程大学 计算机科学与技术系,哈尔滨 150001
  • 收稿日期:2008-01-28 修回日期:2008-04-08 出版日期:2009-03-21 发布日期:2009-03-21
  • 通讯作者: 谢志强

Research on improved algorithm of DES based on prefix codes

XIE Zhi-qiang1,GAO Peng-fei1,YANG Jing2   

  1. 1.Department of Computer Science and Technology,Harbin University of Science and Technology,Harbin 150080,China
    2.Department of Computer Science and Technology,Harbin Engineering University,Harbin 150001,China
  • Received:2008-01-28 Revised:2008-04-08 Online:2009-03-21 Published:2009-03-21
  • Contact: XIE Zhi-qiang

摘要: DES算法自出现以来便面对许多威胁,根据DES算法易受穷举攻击法、选择明文攻击法等方法攻击的缺陷,提出了一种新的基于前缀码的改进方案。通过改变子密钥的顺序来提高抵抗某些攻击的能力,在基本不影响DES算法效率的前提下,很好地提高了DES算法的安全性。

关键词: 数据加密标准算法, 前缀码, 加密, 解密, 改进

Abstract: DES algorithm has been facing to a lot of threat since it came out.It can be attacked easily by exhaustion attack method and chosen plaintext attack method.According to this defect of DES algorithm,this paper puts forward a kind of improved method which is based on prefix codes.By the improvement of the adjustment of the sub-key’s order,the algorithm can advance the ability to resist some attacks.With the improvement it has no effect on the efficiency,but can enhance the security greatly.

Key words: Data Encryption Standard(DES) algorithm, prefix codes, encryption, decryption, improvement