摘要：为了提高图像的加密效果和加密效率，给出一种新的图像置乱加密算法。
Absrtact: To improve the effect and the speed of image encryption, a new image encryption algorithm is presented.
本文讨论了现有的置乱加密方式，并结合该方式的周期性，提出了一种置乱反变换恢复的方式。
This text discuss that place confusion to encrypt a method existingly, and combine the periodic of that method, put forward a kind of method that places confusion and anti- transformation to recover.
然后再选择另一对初始值和参数生成混沌序列，并以该混沌序列的主遍历矩阵对每图像子块进行置乱加密。
Then every block is scrambled with a new chaos sequences generated from the other pair of initial value and parameter.
研究了一类具有良好隐蔽性的一元三次离散动力系统的混沌序列产生情况，提出了混沌序列的异或和置乱加密算法。
The chaos sequence procedure of a kind of discrete dynamic system with good concealing feature is studied, and two algorithms about chaos sequence are provided.
另一方面，同步在采用“模-数-模”方法实现的模拟信号置乱加密通信中非常重要，必须在信息信号中加同步头信号。
On the other side, synchronization in "analog-digital-analog" scramble communications is very important, and the synchronizing signal must be inserted into information signals.
另一方面，同步在采用“模-数-模”方法实现的模拟信号置乱加密通信中非常重要，必须在信息信号中加同步头信号。
On the other side, synchronization in "analog-digital-analog" scramble communications is very important, and the synchronizing signal must be inserted into information signals.
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