Generation and Realization of Digital Chaotic Key Sequence Based on K-L Transform

Chaotic special properties make the chaotic encryption technology to be an important research field of information science and technology. However, as digital chaos is affected by the limited precision of computer, chaos system properties present degradation--short periodicity of output sequence. This paper proposes K-L transform method for Logistic 0/1 sequence, and then analyses time-autocorrelation, complexity, frequency spectrum and time-frequency of the sequence. Simulation results prove that this method can effectively improve the complexity of key sequence. More than that, it also can increase the period of Logistic sequence, which makes up the short periodicity phenomenon of digital chaotic sequence. So this kind of digital chaotic key sequence can be applied safely to encryption system.