摘要
对一种基于单向混沌函数的图像加密算法进行了安全性分析.分析了此混沌函数的性质,指出其对控制参数不敏感,迭代产生的密钥流不是均匀分布,零值分布偏多.提出一种选择明文攻击方法,可以在一定精度范围内估计加密算法的密钥值.实验结果表明,该加密算法对于选择明文图像攻击是不安全的,对混沌轨道和密钥流序列进行有效隔离可增强其安全性.
The security of an image encryption scheme based on one-way chaotic function was analyzed. This paper analyzes the properties of the chaotic function, and points out that chaotic function is not sensitive to the control parameters; the key stream generated by the chaotic map is not uniform. Proposed a kind of chosen-plaintext attack based on these defects, the keys of the encryption algorithm can be recovered to some precision extent. Experiments suggested that the image encryption algorithm is not secure enough, and could not be used in strict applications. To isolate the chaotic orbit from key serenm lould enhance.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第6期52-55,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(10272113)
关键词
图像加密
混沌密码学
密码分析
选择明文攻击
加密算法
image encryption
chaotic cryptography
cryptanalysis
chosen-plaintext attack
encryption algorithm
