Harmonically Coupled Chaotic System for a Pseudo-random Bit Generator
Chaotic systems own many unique properties,based on which they are often applied for pseudo-random bit generators(PRBG).This paper proposes a new kind of coupling-independent-variable harmonic coupling,and constructs a new chaotic system based on tent map.Afterwards,the chaotic property of the system is analyzed in detail and a PRBG is designed based on it.Five tests such as Frequency test,Serial test,Poker test,Runs test,Auto-correlation test show that the PRBG possesses good pseudo-randomness.At last,the linear complexity of generated sequences and the cipher space of the PRBG are analyzed in brief,and a simple stream cipher is designed.