摘要
基于宽带混沌激光作为物理熵源,提出一个性能稳定的高速物理随机数发生器实现方案.利用差分比较器对宽带混沌信号延迟作差,再经由时钟控制的触发器进行采样保持以及后续异或处理,实验获得了速率为1.44Gbit/s的随机数.该方案免去了精确的阈值电压调节过程,利用差分比较纠正了混沌幅值概率密度分布的偏差,使混沌幅值分布的中值偏斜度系数为γ=1.5×10-6.此实验系统可抗外界波动信号的干扰,能够连续稳定工作至少12h.
A scheme of a robust high-speed physical random number generator is proposed by utilizing chaotic light as entropy source.The chaotic signal and its delayed signal are subtracted to produce a series of binary code by a differential comparator.The D flip-flops triggered by a clock sample the output of the comparator.A random bit sequence at rates of up to 1.44 Gbit/s is obtained after the exclusive OR operation.The results show that the scheme does not require the accurate tuning of a decision threshold value,and can correct the probability density distribution deviation of chaos signal amplitude through a differential comparison.The corresponding Pearson median skewness coefficient is γ = 1.5×10-6.The experimental system can be free from the interference of external fluctuations with stable operation of over 12 h.
出处
《科学通报》
EI
CAS
CSCD
北大核心
2011年第33期2746-2752,共7页
Chinese Science Bulletin
基金
国家自然科学基金(60927007
61001114)
山西省自然科学基金(2010021003-4)资助项目
