摘要
为了提高加密算法的性能,设计一种基于改进型参数切换混沌的图像加密算法。首先根据符号逻辑映射序列自适应选择正弦、余弦或帐篷映射生成参数切换混沌随机序列。选取与行数、列数等长的混沌序列排序生成混沌有序索引值作为行列置乱索引,依次对图像按行、列进行置乱,将剩余混沌序列扩展后与置乱的图像像素按比特进行异或加密得到加密图像,提高密钥空间。实验结果表明,该算法的密钥空间较大,能够较好地抵抗攻击。
To improve the encryption performance of the image encryption scheme,this paper proposes an image encryption scheme using improved parametric switching chaotic system.The proposed scheme firstly selects the Sine mapping,Cos mapping or Tent mapping adaptively according to the sequence of Logistic mapping to generate the random sequence of parametric switching chaotic system.Secondly generates scrambling indexes of rows and columns with chaotic ordered indexes by sorting the chaotic sequence with the same number of rows and columns.Thirdly,scrambles the image in row and column by using the scrambling indexes.Lastly,obtains the encrypted image by encrypting the rest patulous chaotic sequence and image pixels in bit with xor operation.This can improve the key space.Experimental results show that the proposed scheme achieves larger key space and better attacks resistance capability.
出处
《成都信息工程学院学报》
2014年第2期133-139,共7页
Journal of Chengdu University of Information Technology
基金
国家自然科学基金资助项目(60970122)
国家教育部博士点基金资助项目(20090184120021)
中央高校基本科研业务专项基金资助项目(SWJTU09CX039
SWJTU10CX09)
关键词
信息安全
图像加密
混沌映射
参数切换
行列置乱
逻辑映射
information security
image encryption
chaotic map
parametric switching
row-column scrambling
logistic mapping
