摘要
文章提出了一种利用离散余弦变换(DCT)和混沌系统相结合的图像加密算法,首先利用DCT将图像在频率域压缩,然后利用混沌系统分别生成置换规则和混沌符号序列对压缩后的数据在频率域加密.通过仿真实验表明,文章所提出的算法,在取得良好的加密效果同时,还具有一定的压缩性能,并且可以根据需要对压缩性能和加密效果进行适当的调整.
This paper puts forward a kind of image encryption algorithm based on the discrete cosine transform（DCT ）and chaotic system .firstly ,the DCT is used to compress image in frequency domain ,then replacement rule and chaotic sequence of symbols was generated respectively by using chaotic system to en‐crypt the compressed data in the frequency domain ,Simulation results show that the proposed algorithm can not only make good encryption effects ,but has the certain compression performance .At the same time , the algorithm can make the appropriate adjustments to the compression and encryption effect according to the need .
出处
《徐州工程学院学报（自然科学版）》
CAS
2014年第4期39-43,共5页
Journal of Xuzhou Institute of Technology(Natural Sciences Edition)
基金
国家自然科学基金项目(U1261105)
徐州工程学院科研资助项目(XKY2011203)
徐州市科技计划项目(KC14GX099)
关键词
混沌序列
离散余弦变换
图像加密
图像压缩
chaotic sequence
discrete cosine transform
image encryption
image compression
