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一种改进的混沌掩盖技术 总被引:1,自引:0,他引:1
该文分析了目前混沌掩盖系统存在的问题,产生的原因并提出了改进的方案。通过理论分析和计算机仿真,证明了改进方案真正实现了混沌掩盖通信。与原型系统对比,改进方案同时改善了系统的性能。 相似文献
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蔡氏电路混沌同步保密通讯 总被引:32,自引:1,他引:32
两个相同的蔡氏电路(Chua’s Circuit)互相耦合可以实现混沌(Chaos)同步是混沌研究的一个重要成果.也是探索蔡氏电路开发应用的基础。应用蔡氏电路的同步特性实现保密通讯是当前蔡氏电路开发应用研究的一个主要方向。本文在介绍蔡氏电路混沌同步特性的基础上,讨论主—从式蔡氏电路同步保密通讯系统及实现双向通讯和无线传输的可行性.并对这种保密通讯系统的安全性与鲁棒性(Robustness)作了简要的分析. 相似文献
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一种多级混沌同步通信系统 总被引:9,自引:1,他引:9
本文了蔡氏混沌同步通信系统的主要性质和局限性,提出了一种多级混沌安全通信系统,证明了该系统对传输信号可以完全重建,在有效带宽,失真特性及安全性和方面获得了改善。文中出了给利用该系统进行语音数据和静止图像数据传输的实例。 相似文献
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本文对变型蔡氏电路的分岔、混沌和同步特性进行实验研究。在此基础上我们利用变型蔡氏电路成功地进行了混沌保密通讯的实验。 相似文献
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Pizolato J.C. Romero M.A. Goncalves Neto L. 《IEEE transactions on circuits and systems. I, Regular papers》2008,55(4):1108-1115
A secure communication system based on the error-feedback synchronization of the electronic model of the particle-in-a-box system is proposed. This circuit allows a robust and simple electronic emulation of the mechanical behavior of the collisions of a particle inside a box, exhibiting rich chaotic behavior. The required nonlinearity to emulate the box walls is implemented in a simple way when compared with other analog electronic chaotic circuits. A master/slave synchronization of two circuits exhibiting a rich chaotic behavior demonstrates the potentiality of this system to secure communication. In this system, binary data stream information modulates the bifurcation parameter of the particle-in-a-box electronic circuit in the transmitter. In the receiver circuit, this parameter is estimated using Pecora-Carroll synchronization and error-feedback synchronization. The performance of the demodulation process is verified through the eye pattern technique applied on the recovered bit stream. During the demodulation process, the error-feedback synchronization presented better performance compared with the Pecora-Carroll synchronization. The application of the particle-in-a-box electronic circuit in a secure communication system is demonstrated. 相似文献
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基于联合混沌系统的保密通信方法研究 总被引:1,自引:1,他引:0
提出了利用离散混沌系统联合加密来实现保密通信的方法。引用著名的Henon和Lorenz混沌系统作为仿真实验证明了其可行性,混沌系统均采用backstepping和dead-beat同步设计方案,以快速达到同步,理论分析证明,此种方法不仅是可行的,且与非联合混沌系数相比,加强了保密性。混沌屏蔽技术仿真结果也证明,该系统不仅实现简单,容易控制,而且增强了整个系统的保密性能。 相似文献
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Zhengguo Li Kun Li Changyun Wen Yeng Chai Soh 《Communications, IEEE Transactions on》2003,51(8):1306-1312
The paper proposes a digital chaotic secure communication by introducing a magnifying glass concept, which is used to enlarge and observe minor parameter mismatch so as to increase the sensitivity of the system. The encryption method is based on a one-time pad encryption scheme, where the random key sequence is replaced by a chaotic sequence generated via a Chua's circuit. We make use of an impulsive control strategy to synchronize two identical chaotic systems embedded in the encryptor and the decryptor, respectively. The lengths of impulsive intervals are piecewise constant and, as a result, the security of the system is further improved. Moreover, with the given parameters of the chaotic system and the impulsive control law, an estimate of the synchronization time is derived. The proposed cryptosystem is shown to be very sensitive to parameter mismatch and hence the security of the chaotic secure communication system is greatly enhanced. 相似文献
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The topic of hidden attractors is a very hot topic in nonlinear dynamics. Multi-stability is another important topic in that area. One recent important category of multi-stable systems is “systems with extreme multi-stability”. In this paper we introduce a new five-dimensional chaotic system with both hidden attractors and extreme multi-stability. Such systems are very rare in literature. Also, we show its feasibility by the help of electronic circuit implementation. 相似文献
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利用海森堡测不准原理和量子不可克隆定律的量子密码体制被证明是无条件安全。由于产生和检测单光子比较困难,且基于离散变量的量子密钥分配难以获得高的信息传输速率,本文介绍了利用混沌系统的特性,通过初始密钥使通信双方设置相同的系统参数和初始状态,从而获得密钥量的扩展,并讨论了方案的安全性。 相似文献
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混沌电路同步及其在通信中的应用研究 总被引:2,自引:0,他引:2
混沌在实际系统中是很常见的,但直到最近工程人员大都把它作一种无用的东西并极力去避免它。本文给出了一个蔡氏电路系统在固有的混沌模式下实现同步的可能性。 相似文献
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从混沌序列模型的生成到混沌序列的下载 总被引:1,自引:0,他引:1
以Lorenz混沌方程为例,提出了利用FPGA技术实现混沌序列模型的一种方法。对数字积分器、量化电路进行设计,采用DSP Builder工具形成Lorenz混沌输出序列,并在FPGA实验开发系统上进行了下载,最后使用Agilent公司的1693A逻辑分析仪对实验箱输出的序列进行了观察,详细地讲述了这一系列的过程。该设计方法根据系统需要和资源利用率可适当提高运算精度,并可应用于其他连续混沌系统中,有助于加快混沌系统在信息安全及保密通信领域中的应用。 相似文献
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Hamsa A. Abdullah Hikmat N. Abdullah Waleed A. Mahmoud Al‐Jawher 《International Journal of Communication Systems》2020,33(4)
Recently, the synchronization between two matching chaotic systems to provide confident communication has gained a lot of interest. Continuously, there is a necessity to produce a novel dynamical system to be used in synchronization to implement a strong security system. In this paper, a hybrid chaotic system is suggested and verified for the potential use of secure communication through chaos synchronization. The Lyapunov exponent (LE) and zero‐one (0‐1) tests have been used to verify the performance of the suggested hybrid chaotic system, while National Institute of Standard and Technology (NIST) tests have been applied to verify the randomness properties. And the synchronization has been achieved between master and slave systems by using nonlinear control laws. The simulation outcomes demonstration that the hybrid system has chaotic performance and outstanding randomness characteristic. The statistical results gained for LE test was 0.8822, and for frequency test (FT) was 0.2028, while for the run test (RT) was 0.1924. Accordingly, the suggested hybrid system can be used to evolve functional synchronization algorithms and encryption for image, video, and voice secure communication applications. 相似文献
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该文回顾了过去混沌密码理论与应用的现状及存在的问题,并对其进行了综合评述。重点报道了近年来高维混沌密码及其在多媒体保密通信中的应用与硬件实现技术的进展,其中包括基本理论、设计方法、典型应用以及解决这些问题的思路。在混沌密码设计与安全性能评估方面,报道了以下几个方面的进展:基于反控制方法设计无简并高维混沌密码增强数字混沌的抗退化能力;无退化数字域混沌系统的设计;具有闭环反馈的有限精度高维混沌长周期序列流密码的多轮加密设计方案;高维混沌密码的安全性能评估。在多媒体保密通信中的应用与硬件实现方面,报道了针对手机,计算机,ARM, FPGA, DSP等手持设备所需不同应用业务、广域网和WIFI无线通信网传输的实时远程混沌保密通信应用环境和多位一体的应用平台进行优化融合,创建示范验证系统等若干技术实现问题的进展。该文试图推进国内外未来混沌密码理论及其应用的研究。 相似文献
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Shi-Quan Shao 《中国电子科技》2008,6(3):309-312
In this paper, a fractional order chaotic masking scheme used for secure communication is introduced. Based on the general projective synchronization of two coupled fractional Chen systems, a popular masking scheme is designed. Numerical example is given to demonstrate the effectiveness of the proposed method. 相似文献