摘要
该文提出了一种新的基于五维混沌系统的数字图像加密算法。首先应用改进的五维Lü系统产生5个混沌序列,用其中一个混沌序列对图像进行置乱,接着将置乱后的图像分成4块,分别用剩下的4个混沌序列分别对每块进行像素替代,最后应用评价指标对加密效果和安全性进行分析。实验结果表明,该方法密钥空间大,抗攻击力强,加密图像像素值分布随机,具有较高的安全性和良好的加密效果。
A new image encryption algorithm based on five-dimension chaotic system is proposed in this paper.First,five chaotic sequences are generated by the modified five-dimension Lü system.One of those five chaotic sequences is used to scramble the image,and then divide the scrambled image into four parts,the pixels of every part will be changed using the other four chaotic sequences.At last,the encryption effect and security are analyzed.Simulation experimental results show that this algorithm is of high security and good encryption effect because the key space of this algorithm is large and the cipher image pixels value distributes uniformly.
基金
国家自然科学基金资助项目(60971046)
关键词
混沌
图像加密
算法
chaotic system
image encryption
algorithm
