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由于现有的基于非线性器件的混沌系统(Ikeda系统)容易受到重构攻击,影响通信的安全。在此基础上提出了一种基于非线性器件参数动态变化的光电延迟反馈混沌系统和基于该系统的安全通信方案。通过第一级混沌系统的输出改变注入激光的光强,使得第二级系统的增益系数产生动态变化,增加了系统可控参数的数目,进而对第二级系统的混沌动力学特性进行数值分析。分析了该系统在混沌调制下的同步通信情况,并且分析了增益系数不匹配和延迟时间不匹配等参数不匹配情况对系统同步的影响。实验结果表明本方法能提高混沌系统的复杂性,实现混沌保密通信。
As the existing non-linear device-based chaotic system (Ikeda system) is vulnerable to reconfiguration attacks, affecting the security of communications. Based on this, a photoelectric delayed feedback chaotic system based on dynamic changes of nonlinear device parameters and a secure communication scheme based on this system are proposed. The output of the first-order chaotic system changes the light intensity of the injected laser, which makes the gain coefficient of the second-stage system produce dynamic changes and increases the number of controllable parameters of the system. Then the numerical analysis of the chaotic dynamics of the second-order system . The synchronization of the system under chaotic modulation is analyzed, and the influence of parameters mismatch such as gain coefficient mismatch and delay time mismatch on system synchronization is analyzed. Experimental results show that this method can improve the complexity of chaotic system and achieve chaotic secure communication.