驱动函数切换调制实现超混沌数字保密通信

在主动-被动分解同步的基础上,提出了一种利用不同超混沌系统的驱动函数切换调制实现数字保密通信的方案.根据二进制信号“0”和“1”的传输情况交替发射两个不同的驱动函数,这就增加了发射信号的复杂度,减少了信号的相关性.且通过进行多次非线性变换加密,进一步设置了新的密钥,使得基于预测法的攻击完全失效.理论分析和模拟结果均表明本方案在实现超混沌数字保密通信时的有效性. 关键词： 超混沌 主动-被动分解法 切换调制 保密通信

A switch-modulated method for hyperchaotic digital secure communications based on drive functions

In this paper, a scheme for digital secure communications is proposed by using different drive functions of hyperchaotic systems based on APD approach. Two different drive functions can be alternately sent according to the transmission of binary signal “0" and “1", which will enhance the complexity and decrease the correlation of transmitted signals. Meanwhile, by designing compound nonlinear function transformation for transmitted signals to further intercalate the secret key, a determined intruder is very difficult to retrieve the contents of message signal using forecasting method. Theoretical analysis and numerical simulation results show that this method is effective.