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一种新的混沌调制技术在保密通信中的应用 总被引:1,自引:1,他引:0
提出一种混沌脉冲宽度调制(CPWM)新技术,它将数字信息隐藏在脉冲的宽度之中,给出了基于一维、高维混沌动力学系统的实现模型。讨论了系统的同步措施及保密性;并用Matlab仿真,给出了相关的仿真结果。 相似文献
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在双涡卷混沌吸引子的基础上,以变型蔡氏电路和四阶蔡氏电路为例,提出一种研究四维系统中多涡卷混沌与超混沌吸引子的新方法.根据这一方法,从数学上找到了一种能产生多涡卷的递推规律,其特点是只需给定三个初始值ma,mb和x1,由文中所导出的递推公式,可确定多涡卷吸引子中分段线性奇函数的各个转折点和平衡点的值,从而能在四维系统中产生多涡卷混沌与超混沌吸引子,并且这种方法可以推广到产生任意多个涡卷的情形,因此,它具有一般的规律性.理论分析、计算机模拟和电路仿真结果证明了该方法的可行性. 相似文献
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本文首次用时域有限差分法对波导电光调制器结构进行全波分析。通过引入移动吸收边界条件和自动递归模型,提高了算法的计算精度和效率,获得了调制器结构参数与性能的关系曲线,为实际器件的优化设计提供了重要依据。 相似文献
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Based on the Lü system, a new chaotic system is constructed, which can generate
a Lorenz-like attractor, Chen-like attractor, Lü-like attractor and new
attractor when its parameters are chosen appropriately. The detailed dynamical
behaviours of this system are also investigated, including equilibria and stability,
bifurcations, and Lyapunov exponent spectrum. Moreover, a novel analogue circuit
diagram is designed for the verification of various attractors. 相似文献
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快速有效的单向Hash函数的设计是现代密码学研究的一个热点.提出了一种基于二维超混沌映射的单向Hash函数的构造方法.该方法将原始输入报文按字节进行线性变换以及混沌映射,在所产生的混沌序列中选值作为二维超混沌映射的初始值,对迭代后所得的超混沌信号经过调制构造单向Hash函数.实验与分析结果表明,这种构造方法实现简单、对初值有高度敏感性、具有很好的单向性、弱碰撞性和保密性能.
关键词:
单向Hash函数
二维超混沌
混沌映射 相似文献
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Chaos-based encryption schemes have been studied extensively,
while the security analysis methods for them are still problems
to be resolved. Based on the periodic orbit theory, this paper
proposes a novel security analysis method. The periodic orbits
theory indicates that the fundamental frequency of the spiraling
orbits is the natural frequency of associated linearized system,
which is decided by the parameters of the chaotic system. Thus,
it is possible to recover the plaintext of secure communication
systems based on chaotic shift keying by getting the average
time on the spiraling orbits. Analysis and simulation results
show that the security analysis method can break chaos shift
keying secure communication systems, which use the parameters as
keys. 相似文献