Study And Realization Of Chaotic Secure Wireless Optical Communication

With development of information technology and increasing frequency of information exchange, the research on information security engineering is becoming more and more important. As a novel technology in cryptography, digital chaotic cipher has attracted researchers' dense interest and has been widely studied. Chaos, as a kind of nonlinear phenomenon, have many remarkable characteristics: such as pseudo-random, unpredictability of evolution of its orbits, properties of mixing and sensitivity to initial conditions and system parameters. These characteristics are in accordance with the requirements of cryptography. Research shows that there are some relation between traditional cipher and chaos. Challenges have been set with traditional cryptography because of the bulk data capacity and high redundancy of widely-used patterns and multi-media information, while chaotic cipher has great superiority over the encryption of multi-media information.This paper first introduces the development, rudimentary and relevant knowledge of chaos theory. The relationship between chaos and cryptography from the point of view of chaotic stream cipher is discussed in detail. And studies double chaotic pseudo-random bit sequence algorithm which is based on Logistic map, and how to valid digital chaotic secure wireless optical communication model according to DSP character. Then suggests the detail process that is based on TI Corporation' s CMOS chip which source is human phoneme by DSP system and full analysis. Finally analyses the results of the experiment of this system, and proves its good characters that double chaotic pseudo-random bit sequence makes the information secretly, and easily to achieve in DSP which contains great value in wireless optical communication.