Design of chaotic cryptosystems with time-delay via T-S fuzzy model

In this paper, the design of chaotic cryptosystems with time-delay has been presented. The cryptosystem is composed of cryptograph and chaotic signals. Two time-delay chaotic signals are synchronized by the design of fuzzy observer. This observer gains achieve asymptotic synchronization when the encrypter and decryper start from different initial conditions. The LMI (linear matrix inequality) condition is derived to guarantee the global stability of the time-delay cryptosystem with disturbance rejection. Computer simulation demonstrates that the time-delay cryptosystem owns robust performance.