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Theory and Application of Secret Communication Based on the Unified Chaotic System

Author: MoZhen
Tutor: HanZhengZhi
School: Shanghai Jiaotong University
Course: Theory and New
Keywords: Chaos Unified chaotic model Secure communication DSP
CLC: O415.5
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 1
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Abstract


It is widely believed in the 1980s of the 20th century, the chaotic system is harmful, it brings the elusive uncertainty, the focus of research is the use of control to eliminate the chaos phenomenon, these studies lead to \research direction has also been fruitful results. However, beginning in the 1990s, has been found chaos is a useful phenomenon, it can do a lot of useful meaning of things. As chaotic secure communication is an important application. Chaotic signals with pseudo-randomness, aperiodic, continuous broadband spectrum class noise characteristics, has unusually complex trajectory and unpredictable, and it has a natural concealment, suitable as a confidential communication carrier. At the transmitting end, the information is expressed as a waveform or stream with chaotic; at the receiving end recover the correct information from the received signal. Requirements of the sending and receiving ends of the chaotic system synchronization, or not be able to decrypt the correct information. The innovation of this paper is that: the already chaotic secure communication research has focused on the communication between the two communication design a unified chaotic system based the Finite Population voice secure communication system, the system is characterized by the use of unified chaotic system to generate different types of chaos. Unified chaotic system METEOROLOGICAL and of Chen Guanrong 2001, the system bridges the gap between the Lorenz system and Chen system, and on behalf of the whole chaotic family between the Lorenz and Chen systems, unified chaotic system under the conditions of different parameters can produce different chaotic. So we can generate a different key in the same chaotic system model so limited groups twenty-two communication, but the third party can not decrypt the contents of the communication. Meanwhile, on the DSP chaotic secure communication systems we design, we selected DSP systems the TI company the TMS320VC5416 DSP STARTER KIT (DSK) TMS320C5416 DSK is TI's application by DSP development platform and application assessment tools . The TMS320C5416 DSK mainly includes a VC5416 target board and a run on a PC, an integrated development environment - Code Composer Studio v2.1 IDE. VC5426 connected through the USB interface with the host. Use Code Composer Studio (CCS) to complete the process of writing, and then go through the process of compiling and linking generate executable code, the executable code is downloaded to the target board memory to run. Moreover, TMS320C5416 DSK include a PCM3002 chip that TI has introduced a 16/20 stereo audio codec chip, PCM3002 audio input interface sampled analog signal, and then converted into a digital signal by the microprocessor (DSP) processing. The microprocessor data processed by the PCM3002 is converted into an analog signal output. Finally, according to the characteristics of the system, there is provided a number of anti-noise measures. Include: DSP board's anti-noise measures, communication channels carry noise measures, the anti-noise measures in the software, and voice enhancement measures.

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CLC: > Mathematical sciences and chemical > Physics > Theoretical Physics > Nonlinear physics > Chaos Theory
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