期刊论文

Tu, L.(tulip1903@163.com)

中文

中南大学学报(自然科学版)

1672-7207

2014

45

6

1893-1899

国家自然科学基金资助项目（61374086）； 湖南省科技计划项目（2013FJ3087,2012FJ4329）；

本校为其他机构

提出一个利用广义Logistic 映射构造的二维非线性混沌映射,采用相图、分岔图分析方法,研究该混沌映射的非线性动态特性;利用该二维混沌方程生成混沌序列,将混沌序列进行优化改进,生成密钥序列;采用输出反馈的加密方式,改变图像的像素,达到加密的目的。实验仿真结果表明:该加密算法对明文和密文都非常敏感,混沌序列的选择极其敏感地依赖于明文,有效地提高了抵御选择明文攻击的能力;密文图像信息熵为7.974 3,接近理想值8.000 0,因而加密图像像素具有类随机均匀分布特性;加密图像和明文图像之间的相关性非常小,相邻像素具有零相关特性,而且密钥空间达到299 bit,加密方法大大改变了明文图像的像素,使...

A nonlinear coupled two-dimensional generalized Logistic chaotic mapping was proposed by using phase maps and bifurcation graphics, and the complex nonlinear dynamic activities of two-dimensional formula were studied. By using the coupled two-dimensional generalized Logistic chaotic mapping a chaotic sequence was generated, then the chaotic sequence was optimized into secret key stream, and output-feedback technology was introduced in this encryption algorithm, which changes pixels. The results show that the encryption algorithm is extremely sensitive to the key and the encrypted image, the ch...