Thesis title : Enhancing the security of a communication system using fractional-order chaotic systems

Abstract

Chaotic systems are with highly nonlinear and complex dynamics. Furthermore, chaotic systems are extremely sensitive to initial conditions with the random-system-like behavior. Due to the high unpredictable and random-look nature of chaotic systems, chaos synchronization schemes have been applied for the secure communication systems (SCSs). This thesis includes the design of a fractional-order chaotic safe communication system. Recently, there are no way that allow identification of the order of derivative, and identifiability of fractional-order derivatives stays an open problem. - On the emitter side, a fractional-order chaotic system is used as the drive system to create the encrypted message signal. - The input secret message is modulated in the chaotic dynamics by insertion rather than being directly inserted to the chaotic signal on the transmission line. - At the receiver side, a step-by-step fractional-order chaotic observer subject to unidentified input is suggested as the response system to get robust synchronization between the emitter and the receiver. - After chaos synchronization is attained at the receiver side, an estimation of the state variables is obtained, and the original message is recovered.