Abstract: Regarding to degeneration of dynamics characteristics in a traditional single chaotic system,we propose a switch controller chaos pseudo random bit generator(SCS-PRBG) based on multiple chaotic systems and switch control.Theoretic analysis of random key stream and its performance show that the key stream has better randomicity and security.With parallel computation,the speed of encryption is improved. The expriment indicates better security of this algorithm.

Key words: multiple chaotic systems, switch control, pseudo random, key stream, security