Design and implementation of hyper chaotic masking system for secured audio transmission

摘要

In last two decades, a large number of chaotic systems have been proposed to be suitable for large data securing such as image, video and audio data. In the present work the phenomenon of secure communication with chaos masking has been investigated and implemented by using Field Programmable Gate Array (FPGA) and Advanced RISC Machine (ARM) processor. The higher dimensional chaotic system has been used rather than low dimensional chaos system because it has more parameters and more complex attractors than regular chaotic system which makes the system is strong in secure data transmission. A signal masking technique based on eight-dimensional chaotic system is proposed which uses hyper chaotic signal as a base carrier signal for audio signal modulation in the transmitter system. The scheme recovers the information signal exactly at the receiver. The simulation investigation shows that the proposed model has the characteristic of sensitive dependence on initial conditions which leads to a large key space. The proposed algorithm is then implemented by hardware and the analysis for depending on variation of initial conditions is investigated. This property of high dependence on small variation on initial conditions leads to more secured system.