摘要
本文对D.R.Frey(1993)提出的基于非线性递归数字滤波器的混沌保密通信系统的参数选取、适用条件、抗噪声能力以及保密能力等进行了分析,并采用混沌密码序列来提高该通信系统的保密性。模拟结果表明,该系统具有一定的可靠性和保密性,而且结构简单、容易实现。
The chaotic secure communication method proposed by D. R. Frey (1993) is studied. The system is composed of regressive nonlinear digital filters. Several practical aspects of the communication are analyzed, such as the correlation functions, the tolerance to noise, the sensitivity to parameter mismatches and the effect of finite word length, etc. Another chaotic system is introduced to increase the security of the communication. Simulation result shows that the method is secure and easy to realize.
基金
国家自然科学基金
上海市重点学科基金
关键词
混沌信号
自同步
保密通信
有限字长效应
Chaotic signal, Self-synchronization, Secure communications, Nonlinear digital filter, Effect of finite word length
