计算机工程 ›› 2011, Vol. 37 ›› Issue (01): 137-138,141.doi: 10.3969/j.issn.1000-3428.2011.01.047

• 安全技术 • 上一篇    下一篇

对LZ混沌序列密码算法的分割攻击

汪海明,李 明,金晨辉   

  1. (信息工程大学电子技术学院,郑州 450004)
  • 出版日期:2011-01-05 发布日期:2010-12-31
  • 作者简介:汪海明(1962-),男,研究员,主研方向:密码学;李 明,硕士;金晨辉,教授
  • 基金项目:
    河南省杰出青年科学基金资助项目(0312001800)

Divide-and-conquer Attack on LZ Chaotic Sequence Cipher Algorithm

WANG Hai-ming, LI Ming, JIN Chen-hui   

  1. (Institute of Electronic Technology, University of Information Engineering, Zhengzhou 450004, China)
  • Online:2011-01-05 Published:2010-12-31

摘要: 分析基于混沌的伪随机序列密码算法的安全性,发现该算法具有所产生密钥流序列的前几个值对密钥低位比特的变化不够敏感的性质,不适合将混沌映射的参数作为密钥。为此,提出一个能够有效降低密钥熵的分割攻击方法,理论分析和实验结果证实了该方法的有效性。

关键词: 混沌密码, 密码分析, 分割攻击

Abstract: This paper analyzes the security of a chaos-based stream cipher, it is found that the first several key stream bits of this chaotic cipher are not sensitive to the least significant bits of key, the parameter of chaotic mapping is not suitable as a key. Based on this information leaking, a divide-and-conquer attack is presented to decrease the entropy of key, and its effectiveness is confirmed by theoretic analysis and trials.

Key words: chaotic ciphe, cryptanalysis, divide-and-conquer attack

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