忆阻器和忆容器混沌电路及其在网络云存储文件中的应用

发布时间：2018-05-24 22:26

本文选题：忆阻器 + 忆容器　；参考：《杭州电子科技大学》2017年硕士论文

【摘要】：自1971年Chua提出忆阻器的概念后,直到2008年HP实验室才首次使用纳米级的TiO_2薄膜成功制作出忆阻器的物理模型,证明了忆阻器是真正存在的。2009年Chua又在忆阻器的基础上丰富了记忆器件的概念,提出了忆容器和忆感器,之后以忆阻器为主要研究方向的记忆器件的研究迅速成为了国内外学者的热点课题。但是目前由于受到制作材料以及制作工艺的限制,记忆器件并没有实现市场化,即使是HP实验室实现的忆阻器也仅存在于实验室中,更不用说后来才被人们关注的忆容器和忆感器,因此通过建模对忆容器进行预先研究在忆容器的发展历程中具有重要意义。本文研究了忆容器的定义,提出了一个电荷控制和一个电压控制的忆容器数学模型,创建了它们的等效电路,并构造了一个同时含有荷控忆容器和HP实验室TiO_2忆阻器的混沌振荡电路,分析了其动力学特性和混沌序列的随机性,最后将其应用于网络云存储文件加密中。本文的创新性工作主要包括以下几个方面:(1)在HP实验室TiO_2忆阻器的基础上提出了一个荷控忆容器和一个磁控忆容器数学模型,并对其端口特性进行理论分析,并根据忆容器的数学模型分别给出了对应的等效电路,通过Multisim软件进行仿真,在正弦信号激励下其伏库特性完全符合忆容器的滞回特性,进一步验证了忆容器模型的非线性特性。(2)研究混沌的基本理论,分析了一些常见的混沌系统特性,在传统二维离散Henon映射的基础上提出了一个优化的离散映射,对其动力学特性如分叉图和最大Lyapunov指数进行了理论和仿真分析,发现其具有更大的混沌参数区间,因而增大了序列的秘钥空间,提高了安全性。最后,给出了该映射在图像加密中的一种应用。(3)为进一步探索记忆器件的非线性特性,设计了一个同时包含荷控忆容器和HP TiO_2忆阻器的混沌振荡电路。对其复杂的动力学特性,包括平衡点集、分岔图、Laypunov指数谱、时域波形、Poincaré映射等进行了详细分析,发现其具有超混沌、共存吸引子和突发混沌等现象。按照该系统的状态方程设计了一个等效电路,通过Multisim对该电路进行了仿真实验,实验结果与理论结果完全相同。利用DSP技术对该混沌系统的混沌序列实现了量化,采用NIST测试软件对该混沌序列的随机性进行了分析,并与著名的Lorenz系统进行比较,结果表明此混沌序列拥有非常好的随机性。(4)基于所设计的忆容器、忆阻器混沌序列,设计了一个网络云存储文件加密系统,该系统采取一种混沌-AES混合算法,在Windows操作系统下,使用JAVA语言设计了一个网页端的能够对文件加密上传以及解密下载的系统。最后对该系统的加密算法进行了安全性分析,发现该算法对密钥非常敏感,且具有非常大的密钥空间,这使得加密后的文件具有更好的安全性。
[Abstract]:It was only in 2008, after Chua introduced the concept of a resistive device in 1971, that the physical model of the device was successfully built by HP Labs for the first time using nanoscale TiO_2 thin films. In 2009, Chua enriched the concept of memory device and put forward the memory container and sensor. After that, the research of memory devices with memory resistor as the main research direction has quickly become a hot topic for scholars at home and abroad. But at present, because of the limitation of material and process, memory devices are not market-oriented, even the memory devices realized by HP Labs only exist in the laboratory. Not to mention the memory container and sensor which were paid attention to later, so it is very important to study the memory container in advance through modeling in the course of the development of the memory container. In this paper, the definition of memory vessel is studied, and a mathematical model of memory vessel with charge control and voltage control is proposed, and their equivalent circuits are created. A chaotic oscillating circuit with both charge controlled memory container and HP lab TiO_2 resistor is constructed. Its dynamic characteristics and randomness of chaotic sequence are analyzed. Finally, it is applied to network cloud storage file encryption. The innovative work of this paper mainly includes the following aspects: 1) on the basis of TiO_2 resistor in HP laboratory, a mathematical model of a charge controlled memory vessel and a magnetic controlled memory container is proposed, and its port characteristics are theoretically analyzed. According to the mathematical model of the memory vessel, the corresponding equivalent circuits are given, and the simulation results by Multisim software show that the storage characteristics of the memory vessel under sinusoidal excitation are fully consistent with the hysteresis characteristics of the memory vessel. Furthermore, the nonlinear characteristics of the memory container model are verified. (2) the basic theory of chaos is studied, and some common chaotic system characteristics are analyzed. Based on the traditional two-dimensional discrete Henon map, an optimized discrete map is proposed. The dynamic characteristics such as bifurcation graph and maximum Lyapunov exponent are analyzed theoretically and simulated. It is found that the chaotic parameter interval is larger and the secret key space of the sequence is enlarged and the security is improved. Finally, an application of this mapping in image encryption is presented. In order to further explore the nonlinear characteristics of memory devices, a chaotic oscillating circuit is designed, which includes both a charge controlled memory container and an HP TiO_2 amnesia. Its complex dynamic characteristics, including equilibrium point set, bifurcation diagram Laypunov exponent spectrum, time-domain waveform and Poincar 茅 map, are analyzed in detail. It is found that the complex dynamic properties are hyperchaos, coexisting attractor and sudden chaos. According to the state equation of the system, an equivalent circuit is designed and simulated by Multisim. The experimental results are identical with the theoretical results. The chaotic sequence of the chaotic system is quantized by using DSP technology. The randomness of the chaotic sequence is analyzed by NIST test software, and compared with the famous Lorenz system. The results show that this chaotic sequence has very good randomness. (4) based on the designed memory container and memory resistor chaotic sequence, a network cloud storage file encryption system is designed. The system adopts a chaotic AES hybrid algorithm under Windows operating system. JAVA language is used to design a webpage which can encrypt, upload, decrypt and download files. Finally, the security of the encryption algorithm of the system is analyzed, and it is found that the algorithm is very sensitive to the key and has a very large key space, which makes the encrypted file have better security.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN60

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