本文選題：語音保密通信　切入點：Lorenz系統(tǒng)　出處：《東北大學(xué)》2014年碩士論文

【摘要】：混沌是一種發(fā)生于確定性系統(tǒng)中貌似隨機(jī)不規(guī)則的運動。隨著人們對信息安全的不斷重視,利用混沌進(jìn)行保密通信越來越得到了人們的廣泛關(guān)注,然而現(xiàn)有對混沌保密通信電路的研究大部分都局限于模擬電路,少數(shù)使用數(shù)字電路實現(xiàn)混沌保密通信的研究也主要集中于DSP, FPGA等裸機(jī)數(shù)字平臺,可移植性不好,阻礙其產(chǎn)品化進(jìn)程。隨著物聯(lián)網(wǎng)技術(shù),智能無線移動通信平臺的不斷發(fā)展,開發(fā)一個安全可靠、兼容性好、易于實現(xiàn)的保密通信方法成為研究的熱點。本文從實際應(yīng)用的角度出發(fā),采用理論推導(dǎo)、仿真與實驗相結(jié)合的方法設(shè)計了可以在ARM11微處理器平臺和嵌入式Linux系統(tǒng)上運行的數(shù)字混沌同步系統(tǒng),并將其應(yīng)用到語音保密通信系統(tǒng)中,論文的主要工作如下：首先,從混沌系統(tǒng)的數(shù)字化實現(xiàn)角度出發(fā),針對傳統(tǒng)的Lorenz混沌系統(tǒng)進(jìn)行離散化；并基于PC機(jī),在Linux系統(tǒng)中使用C語言實現(xiàn)Lorenz混沌系統(tǒng)；進(jìn)而利用PC-ARM交叉編譯環(huán)境,基于ARM開發(fā)板,編譯生成可在嵌入式Linux上運行的Lorenz混沌發(fā)生程序。其次,對Lorenz混沌系統(tǒng)的變量反饋同步方法進(jìn)行研究,設(shè)計了單變量反饋同步控制器,使用Lyapunov方法給出了證明,得到了控制器增益的范圍,且數(shù)值仿真結(jié)果表明所設(shè)計控制器可以使系統(tǒng)達(dá)到同步。進(jìn)而編寫適用于ARM的Lorenz混沌同步程序,并進(jìn)行混沌同步實驗,實驗結(jié)果表明同步效果非常理想,十分適合進(jìn)行保密通信系統(tǒng)開發(fā)。再次,基于Lorenz混沌發(fā)生及同步程序,設(shè)計了網(wǎng)絡(luò)通信模塊、音頻處理模塊、語音加解密模塊等程序,解決了聲音和混沌信號加解密過程中的數(shù)制不統(tǒng)一、數(shù)值不符合掩蓋要求等問題,完整搭建了混沌保密通信系統(tǒng),并基于TCP/IP網(wǎng)絡(luò)協(xié)議,使用WIFI模塊成功實現(xiàn)了混沌保密通信。最后對本文的工作進(jìn)行了總結(jié),并對下一步的研究方向進(jìn)行了展望。
[Abstract]:Chaos is a seemingly random and irregular motion occurring in a deterministic system.As people pay more and more attention to information security, people pay more and more attention to secure communication by using chaos. However, most of the current research on chaotic secure communication circuit is limited to analog circuits.A few researches on chaotic secure communication using digital circuits are mainly focused on the bare machine digital platforms such as DSP, FPGA, etc., which have poor portability and hinder the process of production.With the development of Internet of things (IoT) technology and the development of intelligent wireless mobile communication platform, it has become a hotspot to develop a secure, reliable, compatible and easy to implement secure communication method.In this paper, a digital chaotic synchronization system which can run on ARM11 microprocessor platform and embedded Linux system is designed by theoretical derivation, simulation and experiment from the point of view of practical application.The main work of this paper is as follows: firstly, from the point of view of digital realization of chaotic system, the traditional Lorenz chaotic system is discretized and based on PC.C language is used to realize Lorenz chaotic system in Linux system, and then PC-ARM cross-compiling environment is used to compile and generate Lorenz chaotic generating program which can run on embedded Linux based on ARM development board.Secondly, the variable feedback synchronization method for Lorenz chaotic system is studied, and the single variable feedback synchronization controller is designed. The Lyapunov method is used to prove that the gain range of the controller is obtained.The numerical simulation results show that the controller can make the system synchronization.Then the Lorenz chaotic synchronization program suitable for ARM is written, and the chaotic synchronization experiment is carried out. The experimental results show that the synchronization effect is very ideal, and it is very suitable for the development of secure communication system.Thirdly, based on the Lorenz chaos generation and synchronization program, the network communication module, audio processing module, speech encryption and decryption module and other programs are designed.Based on the TCP/IP network protocol, the chaotic secure communication system is successfully implemented by using the WIFI module.Finally, the work of this paper is summarized, and the next research direction is prospected.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN918;O415.5

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本文編號：1725952