【作者】 杨宏；

【导师】 盛利元；

【作者基本信息】 中南大学 ， 物理电子学， 2002， 硕士

【摘要】 混沌由于其内禀随机性而适于在保密通信中应用。本文对混沌动力学与混沌保密通信进行综述后,采用Matlab仿真技术,系统地分析了典型混沌系统的动力学特性,为设计保密性能更好的混沌保密通信系统奠定了技术基础;首先,通过对Logistic映射全面的特性分析,从理论上证明了Logistic映射用于保密通信的有效性,在此基础上设计了基于Logistic映射的混沌参数调制方案,分析和模拟表明,这种混沌通信系统具有实现方便、性能可靠的特点;然后,重点研究了混沌动力学、现代密码学和通信技术之间的融合,提出了基于计算机网络通信协议的混沌加密方法,通过计算机仿真实验实现数字语音、图像、文本的保密通信,取得了满意的结果;最后,设计了基于混沌编码和混沌同步技术的实时混沌保密通信系统,对蔡氏电路和超混沌实时保密通信系统的仿真结果表明,该系统克服了混沌掩盖保密性差的不足,有效提高了通信的安全性。由于实时混沌保密通信系统综合了非线性理论、密码学以及通信技术的新成果,将在信息安全中具有广阔的应用前景。更多还原

【Abstract】 Chaos is suitable for secure communication because of its intrinsic stochastic property. In this paper, in order to prepare the technical basis for designing chaotic secure communication systems with better security, chaos dynamics and chaotic secure communication are surveyed, and the dynamic properties of the typical chaotic systems are analyzed systematically by way of Matlab simulation. First, a detailed analysis of the characteristic of Logistic-Map on theory indicated that Logistic-Map is suitable for secure communication applications, and a chaotic parameter demodulation scheme is designed. The results of the analysis and simulation show that the chaotic communication system possesses good reliability and can be implemented easily . Then, after it studies mainly the amalgamation among chaos dynamics, cryptology and communication technology, a chaotic encryption method is proposed based on computer network communication protocol . The computer experiments for secure communication of digital voice messages, digital image and text are implemented and the results are satisfactory. Finally, the author designs a real-time chaotic secure communication system based on chaotic coding and chaotic synchronization technology. Taking Chua’s circuit and a hyperchaos system as examples, the computer simulations disclose the system can overcome the shortage of chaotic masking and improve the security efficiently. Real-time chaotic secure communication system synthesize the new research achievement of nonlinear theory, cryptology and communication technology, and it will be applied widely in the field of information security.更多还原