基于Tent混沌序列的数字图像加密方法

摘要

Tent混沌映射结构简单但产生的混沌序列随机性能好，采用NIST测试能权威地检测序列的随机性能。通常运用混沌加密数字图像时，都是指定初值和控制参数。在此使用改进后的混沌序列，把初值的产生和明文图像联系起来，对图像进行置乱，再改变灰度值。仿真验证了此算法加解密的有效性和良好的安全性能。%Tent chaotic mapping structure is simple,but has good chaotic sequence random performance,which can be de-tected by NIST(National Institute of Standards and Technology). When chaos is applied to the digital image encryption,the ini-tial value and the control parameters of the chaotic systems are always given. The improved chaotic sequence is used in this pa-per to connect the generation of the initial value with the plaintext image. The random sequences generated by Tent mapping are employed in scrambling the image and changing the pixels of the image. The simulation results show that the algorithm is valid and has perfect safety performance for the encryption and decryption.