Voice Chaotic Secure Communication Via Wi-Fi Wireless Transmission

Chaos is a subject, which began in the late twentieth century. Then scholars believe that it is one of the three theoretical discovery of the twentieth century. The features of Chaotic natural concealment, self-similarity, unpredictability, and easy to implement make it particularly suitable for sure communication. Voice is one of the important means of human information. Voice communication is also one of the most commonly used, the most convenient modern communication methods. Research and implement voice encryption to ensure the security of voice communication has an important significance. With the rapid progress of computer technology, people have become increasingly demanding on the "move". The introduction of Wi-Fi meets the users’demand that anytime, anywhere have access to the external network. It has no complexity of the wired network, high cost of wiring, and has fast access speed, widely coverage and low-cost. Today it is becoming a mainstream form of wireless communication, and be popular with manufacturers and users.In this thesis, we study a method that based on Wi-Fi wireless transmission and voice chaostic security communication. Firstly two-dimensional cat map as a starting point, analyzed the working principle of the N dimension cat map and apply it to WAV format audio file encryption, file decryption. Secondly take Marvell company88w8686Wi-Fi and Samsung S3C2440development board as hardware module, Based on it according to process of Linux device driver development strictly program Wi-Fi module driver, while transplanted a complete set of the embedded Linux operating system including Bootloader kernel, root file system. Then in order to achieve all operations break away form Windows platform, transplanted DHCP for dynamic access to wireless LAN IP, and transplanted madplay player for playing audio files. At last, based on the TCP/IP protocol architecture, built the communication model between services and client, and, ultimately it implemented voice wireless transmission via application program based on ARM hardware platform. Experiment results demonstrated that this project had effective on encryption and decryption, quick transmission speed, small distortion,and achieved the expected effect.