非线性光学系统中混沌序列的加密

Encryption of chaotic sequence in nonlinear optical system

传统混沌序列加密方法易受到噪声影响,导致加密安全性差。基于此,提出非线性光学系统中混沌序列的加密方法。通过分析入射场作用下介质离子、分子以及原子状态,利用麦克斯韦方程组获取波动方程,确定新光波光矢量,对非线性光学系统特性进行分析。引入动力系统Logistic映射获取非线性光学系统中混沌时间信号,根据获取混沌时间信号存在的周期性特点,设置扰动函数以克服混沌序列周期性,使输出的序列与像素相异,对每个像素进行处理,完成非线性光学系统中混沌序列的加密。仿真结果表明:采用所提方法对非线性光学系统中混沌序列加密效果较好,且加密耗时最短约为3.6 s。

The traditional chaotic sequence encryption method is easy to be affected by noise,which leads to poor encryption security.Based on this,the encryption method of chaotic sequence in nonlinear optical system is proposed.By analyzing the states of ions,molecules and atoms in the medium under the action of the incident field,the wave equations are obtained by using Maxwell equations,the new wave light vector is determined,and the characteristics of the nonlinear optical system are analyzed.The chaotic time signal in nonlinear optical system is obtained by introducing the logistic map of dynamic system.According to the periodic characteristics of the chaotic time signal obtained,the disturbance function is set to overcome the periodicity of chaotic sequence,so that the output sequence is different from the pixel,and each pixel is processed to complete the encryption of chaotic sequence in nonlinear optical system.The simulation results show that the proposed method is effective for the encryption of chaotic sequences in nonlinear optical systems,and the shortest encryption time is about 3.6 s.