Research on Digital Image Encryption Based on Composite Chaotic System

Dynamic behaviors of composite chaotic iteration system retain all the special behaviors of each chaotic iteration subsystem and are more complicated than any single chaotic iteration subsystem.This paper proves the relations between the output of composite chaotic iteration system,chaotic iteration subsystem and the composite choosing sequences.If the uniformity with respect to composite choosing sequences is confirmed,it can guarantee that the invariant distribution density of composite chaotic iteration system is 1,which means the value in output space of(0,1) keeps uniform.And if the composite chaotic iteration system is also matched with a conversional operator with the attributions of independence and the same distribution,and applied to the province of digital image encryption,its visual effect and capability parameters have great improvements.It takes a great role in communication,information processing etc..