对一维耦合映象格子保密通信系统的安全性进行了分析,发现该系统在抗误差函数攻击和利用不动点攻击系统方面还存在不足之处,提出了改进方法,该方法使用了扩展密钥和位操作,使改进后的系统具有更强的抗误差函数攻击能力,并能防止利用不动点获取密钥,从而提高了系统的安全性。 The security of the one-dimensional coupled map grid secure communication system is analyzed. It is found that the system has some shortcomings in the field of anti-error function attack and fixed point attack system. An improved method is proposed, The key and bit operations make the improved system more resistant to error function attacks and prevent the use of fixed points to obtain the key, thus improving the security of the system.