The Scheme Of High Speed Physical Random Bit Generator And The Application

Random numbers play extremely significant roles in cryptographic technologies and large scale simulations such as the Monte Carlo method. The generation techniques of random numbers can be classified into two types: pseudorandom number generation and physical random number generators. Pseudorandom numbers are generated from a single random seed using deterministic algorithms. However, pseudorandom sequences have periodicity, which can be the limitation for applications in information security. On the other hand, physical random sequences are generated by physical random phenomena, so they have the good randomness and no periodic, which is fit for cryptography communications. The generation speed of physical random generator is very low, and can not meet the requirement of the ultra-high speed communication. It is found that the semiconductor laser can produce wide bandwidth chaotic waveforms by appropiate external disturbting. Recently, we demonstrated that a scheme of physical random sequence extracting from chaos signal. And experimentally generate random sequences at the rate of up to2.87Gbps. Very recently, extracting random sequences from chaotic lasers have been reported many times. Most of them are using off-line processing softwares to generate high speed random sequences besides Uchida experimentally generate the sequences passing statistical tests of randomness with the rates equivalent to1.7Gbps.In the paper, according to the scheme of generating random sequence based on the chaotic laser, the main works are summarized as follows:1A scheme of high speed random number generator based on optical feedback chaotic lasers are proposed, and set up the correspond experimental system. Finally, we have experimental demonstrated that continuous streams of random bit sequences that pass NIST test suit which is the standard tests of randomness can be generated at fast rates of up to2.87Gbps.2In the experiment, the0,1proportion of generated sequences is determined by the comparator threshold. However, the threshold is difficult to determine, we proposed a delay differential detection method. Meanwhile, give some theoretical basis, experimental results and post-processing method to eliminate the randomness of generated sequences by delay differential detecting.3Select the amplifier noise as an entropy source, and experimentally generate random bit at rates up to720Mbps by delay differential detecting. It shown that the proposed delay differential detection method is effective not only for chaotic signals but also for noise signals.4In this paper, we used physical random sequences as the spreading code and set up the direct sequence spread system, meanwhile, numerically simulated by simulink. Compared with the traditional PN code, the anti-jamming ability of the spread spectrum system is strengthened and the security is enhanced.