摘要
研究了一个基于混沌设计的分组密码算法的安全性,发现该算法所产生的混沌序列具有前几个值对混沌初态和参数的低位比特变化不够敏感的性质,在选择明文攻击条件下,提出了攻击加密算法等效密钥的分割攻击方法。分组密码算法的密钥长度为106bit,分割攻击方法的计算复杂性约为260,存储复杂性约为250,成功率为0.9284。
This paper investigated the security of a chaotic block cipher. Found that the firstly several chaotic states generated by this cipher were not sensitive to the initial state and parameter. Under the chosen plaintexts condition, proposed a divide-and-conquer attack on the equivalent key. The length of key is 106 bit, and the computing and memory complexity of the attack are about 2 60 and 2 50 respectively. The success rate is 0.928 4.
出处
《计算机应用研究》
CSCD
北大核心
2010年第6期2294-2296,共3页
Application Research of Computers
基金
国家"863"计划资助项目(2007AA0825)
关键词
混沌密码
分组密码
密码分析
分割攻击
等效密钥
chaotic cipher
block cipher
cryptanalysis
divide-and-conquer attack
equivalent key
