The Influences Of Characters Of Chaotic Laser Source On Random Sequences

With the rapid development of global information technology, especially the popularity of the Internet, information security has received extensive attention from community. In the field of information security, random numbers play a crucial role in many security technologies, such as key management, cryptography protocols, digital signatures and authentication. In order to meet the needs for high-speed, large capacity random number, the extraction of random sequence from broadband chaotic laser signal has become popular.As the physical entropy source of random number generator, due to the sensitivity of chaotic laser signals to outside environment, selecting a proper condition for the generation of random sequences from the complex and diverse states of chaos laser sources become a difficult problem. On the basis of combination of theoretical analysis and data processing, this paper study the impacts of the performance of semiconductor lasers and the parameter settings of chaotic laser source on random sequences. Specifically, the following sections are included:(1) Building the system of broadband chaotic laser source. And we make it as the physical entropy source for random number generator. Then binary random sequences are extracted from the chaotic laser signals through software processing.(2) We make thorough study of the NIST SP800-22random number testing standards. Through analysis of test results of random sequences, random sequence testing items are classified in order to find the impact of chaotic entropy source characteristics to the random sequence easily.(3) Departuring from the angles of distribution of chaotic laser signal. performance of semiconductor lasers and settings of external cavity length, we study the influences of the characteristics of the chaotic entropy source to random sequences. The results show that:●The distribution of chaotic laser signal is closely related to the threshold of random number generator;●Semiconductor lasers’relaxation oscillation frequency will limit the generation rate of random sequence;●The selection of external cavity length will directly determine the cyclical strength of random sequence;According to research’s results, we can adjust the state of chaos purposely, which provide theoretical guidance for the acquirement of high-speed, high-quality random sequences.