Secure digital communication based on Lorenz stream cipher

Abstract

A new cryptosystem approach based on Lorenz chaotic systems is presented for secure data transmission. The system uses a stream cipher, in which the encryption key varies continuously. Furthermore one or more of the parameters of the Lorenz generator is controlled by an auxiliary chaotic generator for increased security. The system is implemented by using two separate Spartan 6 FPGA boards. Security analysis (Section VII) shows the system to have a high degree of security compared to other communication systems.