A multidimensional chaotic stream cipher design based on parameters switching

The properties of chaotic systems, such as nonperiodicity, pseudorandom and sensitivity to initial conditions, are suitable for the sequence encryption. But under the finite precision in practical application, the period and the complexity of the chaotic sequence are hard to determine. A multidimensional chaotic stream cipher generator based on the nonlinear autoregressive filter structure with parameter switching is proposed in this paper. The method makes full use of the chaotic properties. By randomly changing the chaotic parameters, the method can improve the complexity and antiprediction of chaotic sequences. The simulation results show that the chaotic sequences generated by the proposed chaotic stream cipher generator have ideal cryptography properties. Moreover, the structure can be easily implemented using digital circuits.