基于前缀码的DES算法改进研究  

Research on improved algorithm of DES based on prefix codes

作　　者：谢志强[1] 高鹏飞[1] 杨静[2] 

机构地区：[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

出　　处：《计算机工程与应用》2009年第9期92-94,119,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(No.60673131);黑龙江省自然科学基金(No.F200608,No.F0304);黑龙江省教育厅海外学人重点科研资助项目(No.1152hq08)~~

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。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.

关 键 词：数据加密标准算法 前缀码 加密 解密 改进 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]