Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Microcontroller based Chaotic Lorenz System for Secure Communication Applications

암호통신 응용을 위한 마이크로 컨트롤러 기반 로렌츠 카오스 시스템

  • Jayawickrama, Chamindra (Department of Nanoscience and Engineering, Center for Nano Manufacturing, Inje University) ;
  • Song, Hanjung (Department of Nanoscience and Engineering, Center for Nano Manufacturing, Inje University)
  • Received : 2018.08.27
  • Accepted : 2018.09.26
  • Published : 2018.12.31
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Abstract

This paper presents a implementation of a chaotic Lorenz system for data secure communication applications. Here we have used PIC18F family-based microcontroller to generate the chaotic signal, and simulated waveform patterns confirm that the chaotic behavior of the microcontroller based discrete time chaotic Lorenz system. There are three R-2R ladder type A/D converters have been implemented for conversion of direct microcontroller digital output into analog waveform, utilizing this specific microcontroller relevant to this experiment work, microcontroller ports B, C and D have been utilized for its time waveform outputs X, Y and Z respectively. XC8 compiler used for the compilation of the program. MATLAB and PROTEUS software platforms are used for simulation. Finally, chaotic time wave forms, 2D chaotic attractors were obtained and secure communication analog waveforms were also verified by experimental measurement.

본 논문에서는 암호통신 응용을 위한 로렌츠 카오스 회로를 구현한다. 이산형 카오스 로렌츠 시스템을 구현하기 위하여, PIC18F 계열의 마이크로 콘트롤러가 사용되었으며, 제안하는 카오스 회로는, 연산증폭기 기반 아날로그 회로와는 다르게, 8 비트PIC 마이크로 콘트롤러 칩과 3개 R-2R 타입의 디지털-아날로그 변환기로 이루어진다. 마이크로 컨트롤러 포트 B, C 및 D에서 시간 파형 X, Y 및 Z가 출력되도록 하였다. 모의실험을 위하여 MATLAB 및 PROTEUS 소프트웨어 플랫폼이 사용되었다. 제안하는 회로에 대하여, MATLAB 및 프로테우스 프로그램에 의한 모의실험을 통하여 시간파형, 주파수 특성, 2차원 위상특성 해석을 실시하였다. 최종적으로, 카오스 시간파형, 2차원(2D) 어트랙터 가 얻어졌고, 카오스 신호에 기반한 아날로그 신호의 암호통신 검증을 실험을 통하여 확인 하였다.

Keywords

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Fig. 1 Schematic diagram of analog Lorenz circuit.

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Fig. 2 Flow diagram of the algorithm.

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Fig. 3 Schematic diagram of the microcontroller based chaotic lorenz system.

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Fig. 4 PIC18F microcontroller experimental board

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Fig. 6 Two dimensional chaotic attractor Z(V) vs Y (V) axis.

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Fig. 7 Chaotic communication system block diagram

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Fig. 8 Secure data transmission through public channel (a) Message signal (b) Chaotic carrier signal. (c) Chaotic modulated signal. (d) Recovered signal.

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Fig. 9 Experiential setup for chaos communication.

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Fig. 10 Measured chaotic waveform and attractor

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Fig. 11 Experimental verification of chaos communication

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Fig. 5 Chaotic time waveform Y and Z axis vs time.

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