计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (17): 81-82.

• 网络、通信、安全 • 上一篇    下一篇

一类分组密码的安全性能研究

王念平,吴仕文   

  1. 解放军信息工程大学 电子技术学院,郑州 450004
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-11 发布日期:2011-06-11

Researches on security of class of block ciphers

WANG Nianping,WU Shiwen   

  1. Institute of Electronic Technology,PLA Information Engineering University,Zhengzhou 450004,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-11 Published:2011-06-11

摘要: 为评估一类分组密码的安全性能,通过列举的方法,对该分组密码抵抗差分密码分析的能力进行了深入的研究。在轮函数是双射的假设条件下,证明了3,4,6,9,12,4r轮分组密码分别至少有1,2,2,4,6,2r个轮函数的输入差分非零;从而若设轮函数的最大差分概率为p,则3,4,6,9,12,4r轮分组密码的差分特征的概率分别以p,p2,p2,p4,p6,p2r为上界。

关键词: 不平衡Feistel密码, 轮函数, 差分特征概率

Abstract: To evaluate the security of a class of block ciphers,the security analysis against differential attacks is investigated deeply using enumeration method.If the round function is bijective,then the number of active round function for 3,4,6,9,12,4r -round ciphers is not less than 1,2,2,4,6,2r respectively.So the upper bounds of maximum differential characteristic probabilities for 3,4,6,9,12,4r -round ciphers are [p,p2,p2,p4,p6,p2r] if maximum differential probabilities for round function are p.

Key words: unbalanced Feistel ciphers, round function, differential characteristic probabilities